Skip to main content

Barovier Intarsio

"Inlay Vase," Ercole Barovier, Murano 1970-1975
"Inlay Vase," Ercole Barovier, Murano 1970-1975

"Inlay Vase," Ercole Barovier, Murano 1970-1975

By Ercole Barovier

Located in Venezia, IT

Blown vase with alternating yellow and blue tiles. 1970-1975.

Category

Vintage 1970s Vases

Materials

Murano Glass

Murano Barovier Toso Red Intarsio Mosaic Triangle Tessere Italian Art Glass Vase
Murano Barovier Toso Red Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

Murano Barovier Toso Red Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

By Ercole Barovier, Barovier&Toso

Located in Kissimmee, FL

Literature: Art of the Barovier: Glassmakers in Murano 1866-1972, Barovier, ppg. 191-193 illustrate series.

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Glass, Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine

Murano Intarsio White and Transparent Glass, Attributed to Ercole Barovier, 1960
Murano Intarsio White and Transparent Glass, Attributed to Ercole Barovier, 1960

Murano Intarsio White and Transparent Glass, Attributed to Ercole Barovier, 1960

By Ercole Barovier

Located in CABA, AR

Speaking of design, this piece boasts a rarity that sets it apart from the rest. The intricate intarsio technique, a hallmark of Barovier's craftsmanship, is executed with precision ...

Category

Mid-20th Century Glass

Materials

Art Glass

Recent Sales

Ercole BAROVIER - Intarsio platter
Ercole BAROVIER - Intarsio platter

Ercole BAROVIER - Intarsio platter

Unavailable

H 1.97 in Dm 13 in

Ercole BAROVIER - Intarsio platter

By Ercole Barovier, Barovier&Toso

Located in Brussels, BE

Intarsio series (inlay) plate made of fused triangular glass pieces designed by Ercole Barovier (1889-1974) and executed by his own glassworks Barovier e Toso in Murano, Italy.

Category

Vintage 1960s Italian Mid-Century Modern Decorative Bowls

Materials

Murano Glass

Ercole Barovier Intarsio Vase, Murano Glass, Hand-Crafted, Italy, 1963
Ercole Barovier Intarsio Vase, Murano Glass, Hand-Crafted, Italy, 1963

Ercole Barovier Intarsio Vase, Murano Glass, Hand-Crafted, Italy, 1963

By Ercole Barovier

Located in Zurich, CH

Ercole Barovier (1889-1974), a rare 'Intarsio' vase ca. 1963 produced by Barovier & Toso, Murano, Italy Large vase Intarsio series with oval cross-section and decoration of green lo...

Category

Vintage 1960s Italian Vases

Materials

Murano Glass

Rare Intarsio Vase by Barovier & Toso, "Zigzag", 1963
Rare Intarsio Vase by Barovier & Toso, "Zigzag", 1963

Rare Intarsio Vase by Barovier & Toso, "Zigzag", 1963

Unavailable

H 13.08 in W 10.04 in D 5.52 in

Rare Intarsio Vase by Barovier & Toso, "Zigzag", 1963

By Barovier&Toso

Located in Zurich, CH

Rare intarsio vase by Barovier & Toso, 1961-1963. Glass with inclusions, alternating orange and ochre glass tesserae.

Category

Vintage 1960s Italian Mid-Century Modern Vases

Materials

Blown Glass, Murano Glass

Large 1960s Murano Intarsio Glass Vase by Barovier e Toso
Large 1960s Murano Intarsio Glass Vase by Barovier e Toso

Large 1960s Murano Intarsio Glass Vase by Barovier e Toso

By Ercole Barovier, Barovier&Toso

Located in Geneva, CH

Spectacular Murano red and brown glass vase, intarsio technique, design Ercole Barovier for Barovier & Toso, label remains underneath.

Category

Vintage 1960s Italian Mid-Century Modern Vases

Materials

Murano Glass

Barovier & Toso Intarsio Vase, Murano Glass, Hand-Crafted, Italy, 1961
Barovier & Toso Intarsio Vase, Murano Glass, Hand-Crafted, Italy, 1961

Barovier & Toso Intarsio Vase, Murano Glass, Hand-Crafted, Italy, 1961

By Barovier&Toso

Located in Zurich, CH

Barovier & Toso, 'Intarsio' vase fused glass tesserae produced by Barovier & Toso, Murano, Italy ca. 22 cm (height) marked with original label on underside Excellent condition LIT...

Category

Vintage 1960s Italian Vases

Materials

Murano Glass

Ercole Barovier Large Murano Intarsio Vase in Vibrant Blue Colors
Ercole Barovier Large Murano Intarsio Vase in Vibrant Blue Colors

Ercole Barovier Large Murano Intarsio Vase in Vibrant Blue Colors

By Ercole Barovier

Located in Ann Arbor, MI

Rare Color in this amazing Barovier Intarsio Vase designed by Ercole Barovier.

Category

Vintage 1960s Italian Mid-Century Modern Glass

Materials

Blown Glass

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Bowl
Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Bowl

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Bowl

By Barovier&Toso, Ercole Barovier

Located in Kissimmee, FL

Documented to designer Ercole Barovier, for Barovier e Toso, circa 1961-1967 in the "Intarsio" technique.

Category

Mid-20th Century Italian Mid-Century Modern Decorative Bowls

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine, Glass

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase
Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

By Barovier&Toso, Ercole Barovier

Located in Kissimmee, FL

Documented to designer Ercole Barovier, for Barovier e Toso, circa 1961-1967 in the "Intarsio" technique.

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine, Glass

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase
Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

By Barovier&Toso, Ercole Barovier

Located in Kissimmee, FL

Documented to designer Ercole Barovier, for Barovier e Toso, circa 1961-1967 in the "Intarsio" technique.

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine, Glass

Ercole Barovier Murano Intarsio Mosaic Patchwork Tessere Italian Art Glass Bowl
Ercole Barovier Murano Intarsio Mosaic Patchwork Tessere Italian Art Glass Bowl

Ercole Barovier Murano Intarsio Mosaic Patchwork Tessere Italian Art Glass Bowl

By Barovier&Toso, Ercole Barovier

Located in Kissimmee, FL

Signed and documented to designer Ercole Barovier, for Barovier e Toso, circa 1961-1967 in the "Intarsio" technique.

Category

Mid-20th Century Italian Mid-Century Modern Decorative Bowls

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Glass

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase
Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

Ercole Barovier Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

By Ercole Barovier, Barovier&Toso

Located in Kissimmee, FL

Documented to designer Ercole Barovier, for Barovier e Toso, circa 1961 in the "Intarsio" mosaic technique.

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine, Glass

Barovier Toso Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase
Barovier Toso Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

Barovier Toso Murano Intarsio Mosaic Triangle Tessere Italian Art Glass Vase

By Ercole Barovier, Barovier&Toso

Located in Kissimmee, FL

Documented to designer Ercole Barovier, for Barovier e Toso, circa 1961-1967. Published design in many books.

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine, Glass

Ercole Barovier Murano Red Gray Intarsio Mosaic Triangle Italian Art Glass Vase
Ercole Barovier Murano Red Gray Intarsio Mosaic Triangle Italian Art Glass Vase

Ercole Barovier Murano Red Gray Intarsio Mosaic Triangle Italian Art Glass Vase

By Ercole Barovier, Barovier&Toso

Located in Kissimmee, FL

Documented to designer Ercole Barovier, for Barovier e Toso, circa 1961-1967 in the "Intarsio" technique.

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Blown Glass, Murano Glass, Sommerso, Murrine, Glass

Rare Barovier & Toso "intarsio" Vase
Rare Barovier & Toso "intarsio" Vase

Rare Barovier & Toso "intarsio" Vase

Sold

H 14.25 in W 6.25 in D 4.75 in

Rare Barovier & Toso "intarsio" Vase

By Barovier&Toso

Located in Paris, FR

Barovier & Toso "intarsio" vase circa 1961

Category

Vintage 1960s Italian Modern Vases

Materials

Blown Glass

Barovier & Toso Vase ''Intarsio'', 1963
Barovier & Toso Vase ''Intarsio'', 1963

Barovier & Toso Vase ''Intarsio'', 1963

By Barovier&Toso, Ercole Barovier

Located in Zurich, CH

Colorless glass with fused triangular glass plates in blue and green. Measure: H. 23.5 cm. Lit .: Marina Barovier, Art of the Barovier, Fig. 167. Ercole Barovier (draft), Barovier...

Category

Vintage 1960s Italian Mid-Century Modern Vases

Materials

Murano Glass

Intarsio table lamps, pair by Ercole Barovier
Intarsio table lamps, pair by Ercole Barovier

Intarsio table lamps, pair by Ercole Barovier

By Barovier&Toso, Ercole Barovier

Located in Chicago, IL

Signed with partial paper label to underside of each example: [Barovier & Toso Murano].

Category

20th Century Italian Table Lamps

Materials

Brass

Large 'Intarsio' Murano Vase by Enrcole Barovier for Barovier & Toso, 1960s
Large 'Intarsio' Murano Vase by Enrcole Barovier for Barovier & Toso, 1960s

Large 'Intarsio' Murano Vase by Enrcole Barovier for Barovier & Toso, 1960s

By Barovier&Toso, Ercole Barovier

Located in Vienna, Vienna

The large vase from the well known set designed by Ercole Barovier for Barovier & Toso. The set was most likely designed in the 1960 and exhibited at the Triennale in Milan in 1962. ...

Category

Vintage 1960s Italian Mid-Century Modern Vases

Materials

Murano Glass

Intarsio Table Lamps, Pair By Ercole Barovier
Intarsio Table Lamps, Pair By Ercole Barovier

Intarsio Table Lamps, Pair By Ercole Barovier

Located in Chicago, IL

Signed with partial paper label to underside of each example: [Barovier & Toso Murano].

Category

20th Century Italian Table Lamps

Materials

Brass

Tea-colored and Orange Intarsio Vase by Ercole Barovier
Tea-colored and Orange Intarsio Vase by Ercole Barovier

Tea-colored and Orange Intarsio Vase by Ercole Barovier

Located in Hoboken, NJ

Tea-colored and orange "Intarsio" or "Patchwork" vase by Ercole Barovier for Barovier e Toso, Italian circa 1961

Category

Vintage 1960s Italian Glass

Barovier & Toso "Intarsio" Vase Circa 1961-1963
Barovier & Toso "Intarsio" Vase Circa 1961-1963

Barovier & Toso "Intarsio" Vase Circa 1961-1963

Sold

H 9.85 in W 10.24 in D 7.68 in

Barovier & Toso "Intarsio" Vase Circa 1961-1963

Located in Paris, FR

Large vase executed by Barovier & Toso in blown and fused glass with controlled internal bubbles. Designed Circa 1961-63. IMPORTANT NOTICE: - Free shipping from Paris to New York...

Category

Vintage 1960s Italian Vases

Materials

Blown Glass

You May Also Like

Large "Golia" Murano glass vase, by Toni Zuccheri for VeArt, circa 1970
Large "Golia" Murano glass vase, by Toni Zuccheri for VeArt, circa 1970

Large "Golia" Murano glass vase, by Toni Zuccheri for VeArt, circa 1970

By Toni Zuccheri, VeArt

Located in Milano, Lombardia

Large "Golia" vase made of Murano blown glass, in amber and green. Created by Toni Zuccheri for VeArt, circa 1970.

Category

Vintage 1970s European Mid-Century Modern Vases

Materials

Murano Glass

Vintage Transparent Murano Glass Vase by Barovier and Toso, Italy
Vintage Transparent Murano Glass Vase by Barovier and Toso, Italy

Vintage Transparent Murano Glass Vase by Barovier and Toso, Italy

By Barovier&Toso

Located in Bresso, Lombardy

Made in Italy, 1930s - 1940s. This vase is made in hand-blown Murano glass. It is a vintage item, therefore it might show slight traces of use, but it can be considered as in excell...

Category

Vintage 1930s Italian Mid-Century Modern Vases

Materials

Murano Glass

Archimede Seguso Murano Sommerso Red Art Glass Vase with Pulled Details
Archimede Seguso Murano Sommerso Red Art Glass Vase with Pulled Details

Archimede Seguso Murano Sommerso Red Art Glass Vase with Pulled Details

By Archimede Seguso

Located in Barcelona, ES

'Tronco' style red and clear Art glass vase. Attributed to Archimede Seguso, Italy, 1960s An spectacular handblown Murano art glass vase in a vibrant ruby red with pulled details tho...

Category

20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Blown Glass, Murano Glass, Glass, Sommerso

Italian vase in red glass Murano 60s
Italian vase in red glass Murano 60s

Italian vase in red glass Murano 60s

$1,367

H 13.39 in W 4.34 in D 2.76 in

Italian vase in red glass Murano 60s

Located in Ternay, Auvergne-Rhône-Alpes

Very nice vase in blown glass of Murano from the 60s. Excellent craftsmanship with a beautiful shade of red light that enhances the simple and clean design of the vase drop. Very nic...

Category

Vintage 1960s French Mid-Century Modern Glass

Materials

Murano Glass

Ercole Barovier Toso Murano Glass Spira Aurata Vase, 1960s
Ercole Barovier Toso Murano Glass Spira Aurata Vase, 1960s

Ercole Barovier Toso Murano Glass Spira Aurata Vase, 1960s

By Ercole Barovier, Barovier&Toso

Located in Barcelona, ES

Murano Art Glass 'Spira Aurata Striato Vase' by Ercole Barovier, Barovier e Toso, Italy, 1966. Spira Aurata series oval-section conical vase in blown glass with polychrome garnet, r...

Category

20th Century Italian Mid-Century Modern Vases

Materials

Gold Leaf

Rostrato Vase Barovier style, Clear Murano Glass, italian mid-century modern
Rostrato Vase Barovier style, Clear Murano Glass, italian mid-century modern

Rostrato Vase Barovier style, Clear Murano Glass, italian mid-century modern

By Ercole Barovier

Located in Venezia, IT

Rostrato vase in authentic Murano glass, handmade in the typical Rostrato style introduced by Ercole Barovier at the beginning of the twentieth century. Additional information: Mate...

Category

20th Century Italian Vases

Materials

Blown Glass, Murano Glass

Ercole Barovier Rostrato Murano Glass Italian Vase for Barovier & Toso, 1940s
Ercole Barovier Rostrato Murano Glass Italian Vase for Barovier & Toso, 1940s

Ercole Barovier Rostrato Murano Glass Italian Vase for Barovier & Toso, 1940s

By Ercole Barovier, Barovier&Toso

Located in Roma, IT

Fantastic mouth-blown rostrato crystal Murano glass vase. This marvelous decorative piece was realized during the 1940s in Italy by Ercole Barovier for Barovier & Toso. In fabulous ...

Category

Mid-20th Century Italian Mid-Century Modern Glass

Materials

Glass, Art Glass, Blown Glass, Murano Glass

Vase Barovier & Toso -  Murano Glass, 1940 - VENICE - Made in Italy
Vase Barovier & Toso -  Murano Glass, 1940 - VENICE - Made in Italy

Vase Barovier & Toso - Murano Glass, 1940 - VENICE - Made in Italy

By Barovier&Toso

Located in Milano, IT

Vase Barovier & Toso - Murano glass 1940, worked with gold leaf. Iridescent.

Category

Vintage 1940s Italian Mid-Century Modern Vases

Materials

Glass

Flavio Poli for Seguso Sommerso Vase Murano ca. 1953
Flavio Poli for Seguso Sommerso Vase Murano ca. 1953

Flavio Poli for Seguso Sommerso Vase Murano ca. 1953

$1,375

H 10.56 in W 4.53 in D 5.32 in

Flavio Poli for Seguso Sommerso Vase Murano ca. 1953

By Flavio Poli, Seguso Vetri d'Arte

Located in Berghuelen, DE

Flavio Poli for Seguso Sommerso Vase Murano ca. 1953 A large sommerso art glass vase manufactured by Seguso Vetri D'Arte and designed by Flavio Poli in the 1950ties. Seguso model nu...

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Art Glass, Murano Glass

Ercole Barovier Large Rostrato Murano Glass Italian Vase, 1940s
Ercole Barovier Large Rostrato Murano Glass Italian Vase, 1940s

Ercole Barovier Large Rostrato Murano Glass Italian Vase, 1940s

By Barovier&Toso, Ercole Barovier

Located in Roma, IT

Marvelous large mouth-blown rostrato crystal Murano glass vase. This spectacular decorative piece was produced in Italy during the 1940s by Ercole Barovier for Barovier & Toso. In m...

Category

Mid-20th Century Italian Mid-Century Modern Glass

Materials

Glass, Art Glass, Blown Glass, Murano Glass

Murano glass vase by Flavio Poli, Seguso Vetri d’Arte, 1958, Italy
Murano glass vase by Flavio Poli, Seguso Vetri d’Arte, 1958, Italy

Murano glass vase by Flavio Poli, Seguso Vetri d’Arte, 1958, Italy

By Flavio Poli, Seguso

Located in Uccle, BE

Murano glass vase by Flavio Poli, Seguso Vetri d’Arte. Oval necked vase. Referenced in the Seguso archives under number 12089 The model designed in 1958. In sommerso glass, the blue ...

Category

Mid-20th Century Italian Mid-Century Modern Vases

Materials

Blown Glass

Italian Murano Art Glass Transparent Vase by Barovier, Bullicante Model, 1950s
Italian Murano Art Glass Transparent Vase by Barovier, Bullicante Model, 1950s

Italian Murano Art Glass Transparent Vase by Barovier, Bullicante Model, 1950s

By Ercole Barovier

Located in Casale Monferrato, IT

Beautiful Italian desgn mid-century murano art glass transparent vase. This model vase designed by Ercole Barovier (Murano, Italy, 1950s). A stunning little vase made with a distinc...

Category

Vintage 1950s Italian Mid-Century Modern Vases

Materials

Art Glass

20th Century Italian Murano Artistic Glass Vase, 1970s, Transparent Smoked Glass
20th Century Italian Murano Artistic Glass Vase, 1970s, Transparent Smoked Glass

20th Century Italian Murano Artistic Glass Vase, 1970s, Transparent Smoked Glass

Located in Casale Monferrato, IT

Refined artistic glass vase, Italy, production 1970s Murano. Not signed. There is a small original label but without writing. Typical model called a tulip in refined smoked transpare...

Category

Vintage 1970s Italian Glass

Materials

Murano Glass

Mandruzzato Red and Clear Murano Glass Sommerso Block Vase
Mandruzzato Red and Clear Murano Glass Sommerso Block Vase

Mandruzzato Red and Clear Murano Glass Sommerso Block Vase

By Alessandro Mandruzzato

Located in Nuernberg, DE

An amazing Venetian Murano glass Mid-Century Modern Mandruzzato vase made in Italy, circa 1960s. This is a glass block vase. Red within clear. The top of the vase is flat cut. Vase i...

Category

Vintage 1960s Italian Mid-Century Modern Vases

Materials

Art Glass

"VeArt" Enameled Murano Vase, 1980s
"VeArt" Enameled Murano Vase, 1980s

"VeArt" Enameled Murano Vase, 1980s

$398

H 17.5 in W 15 in D 15 in

"VeArt" Enameled Murano Vase, 1980s

Located in Bastia Umbra, IT

"VeArt" Enameled Murano vase, Made in Italy, 1980s.  Light blue "encased" art glass vase with white interior. It is in perfect condition.  The price of shipping is for the Italian te...

Category

Vintage 1980s Italian Mid-Century Modern Vases

Materials

Murano Glass

Mid Century Vintage Artistic Glass Dark Red Burgundy Vase, Europe, 1970s
Mid Century Vintage Artistic Glass Dark Red Burgundy Vase, Europe, 1970s

Mid Century Vintage Artistic Glass Dark Red Burgundy Vase, Europe, 1970s

Located in 05-080 Hornowek, PL

VASE “SCARF” Author: Decorative Glassworks "Makora", Krosno Year of creation: 2nd half 20th century Information: laminated glass, hand-formed, mass decoration with a crack motif. h...

Category

Mid-20th Century Polish Mid-Century Modern Ceramics

Materials

Glass, Murano Glass

Get Updated with New Arrivals
Save "Barovier Intarsio", and we’ll notify you when there are new listings in this category.

Barovier Intarsio For Sale on 1stDibs

Find many varieties of an authentic barovier intarsio available at 1stDibs. Frequently made of glass, murano glass and blown glass, every barovier intarsio was constructed with great care. Whether you’re looking for an older or newer barovier intarsio, there are earlier versions available from the 20th Century and newer variations made as recently as the 20th Century. Each barovier intarsio bearing Mid-Century Modern or Modern hallmarks is very popular. Barovier&Toso and Ercole Barovier each produced at least one beautiful barovier intarsio that is worth considering.

How Much is a Barovier Intarsio?

Prices for a barovier intarsio start at $1,800 and top out at $48,000 with the average selling for $7,900.

Finding the Right Decorative Objects for You

Every time you move into a house or an apartment — or endeavor to refresh the home you’ve lived in for years — life for that space begins anew. The right home accent, be it the simple placement of a decorative bowl on a shelf or a ceramic vase for fresh flowers, can transform an area from drab to spectacular. But with so many materials and items to choose from, it’s easy to get lost in the process. The key to styling with antique and vintage decorative objects is to work toward making a happy home that best reflects your personal style. 

Ceramics are a versatile addition to any home. If you’ve amassed an assortment of functional pottery over the years, think of your mugs and salad bowls as decorative objects, ideal for displaying in a glass cabinet. Vintage ceramic serveware can pop along white open shelving in your dining area, while large stoneware pitchers paired with woven baskets or quilts in an open cupboard can introduce a rustic farmhouse-style element to your den.

Translucent decorative boxes or bowls made of an acrylic plastic called Lucite — a game changer in furniture that’s easy to clean and lasts long — are modern accents that are neutral enough to dress up a coffee table or desktop without cluttering it. If you’re showcasing pieces from the past, a vintage jewelry box for displaying your treasures can spark conversation: Where is the jewelry box from? Is there a story behind it?

Abstract sculptures or an antique vessel for your home library can draw attention to your book collection and add narrative charm to the most appropriate of corners. There’s more than one way to style your bookcases, and decorative objects add a provocative dynamic. “I love magnifying glasses,” says Alex Assouline, global vice president of luxury publisher Assouline, of adding one’s cherished objects to a home library. “They are both useful and decorative. Objects really elevate libraries and can also make them more personal.”

To help with personalizing your space and truly making it your own, find an extraordinary collection of decorative objects on 1stDibs.