Even abstract paintings such as Piet Mondrian's 1912 cubist Gray Tree, which doesn’t visually show treelike colours, can be identified as trees if a realistic value for α is used, researchers say.

By Zachary Small For decades, a small but mighty painting by the artist Piet Mondrian has greeted visitors in the grand vestibule of the Park Avenue apartment where the Barnes & Noble founder ...

Piet Mondrian was an early 20th-century abstract artist and art theorist obsessed with simplicity ... Among my favorite images is a carving of a tree from a late-medieval mosque in India.

On Thursday, Christie's announced that it will sell dozens of works by artists including Pablo Picasso, René Magritte, Giacometti, and Piet Mondrian from the collection of the late Barnes & Noble ...