Simultanism (<modern European fine arts styles and movements>, <modern European styles and movements>, ... Styles and Periods (hierarchy name))
Note: Term invented by artist Robert Delaunay to describe the abstract painting style developed by him and his wife Sonia Delaunay, characterized by interlocking or overlapping areas of contrasting or complementary colors. Derived from the theories of Michel Eugène Chevreul's "On the law of the simultaneous contrast of colours."