What was Piet Mondrian's style of art?

Piet Mondrian's style of art varied over the course of his career. His early works display the characteristics of Post-Impressionism, but his paintings grew more abstract over time. Art historians classify many of his later works as Expressionism or Cubism. Find a selection of Piet Mondrian art from some of the world's top galleries and dealers on 1stDibs.