What art movement is characterized by the use of geometric shapes and bold colors, often seen in works by Piet Mondrian?

The art movement characterized by the use of geometric shapes and bold colors, as seen in the works of Piet Mondrian, is De Stijl. This movement, which emerged in the early 20th century, emphasized abstraction and simplicity, often employing a grid of vertical and horizontal lines combined with primary colors and black and white. Mondrian's work is particularly associated with this style, as he sought to express a universal harmony through the reduction of form to its essential elements.

De Stijl artists aimed to create a new aesthetic that resonated with the modern world and reflected their vision of a utopian society. The geometric compositions in Mondrian's paintings demonstrate a clear departure from naturalistic representation, focusing instead on the inherent beauty of form and color. This approach was integral to the De Stijl philosophy, making it distinct from other art movements.