In 1915, an exhibition of radical artworks opened in Russia. Many pieces pushed the boundaries of form and style, but one was particularly controversial: Kazimir Malevich’s “Black Square.” Criticized as simple and uninspired, Malevich’s work is more complicated than it first appears— and may not be a painting of a black square at all. Allison Leigh digs into the art style known as Suprematism. Lesson by Allison Leigh, directed by Alexia Roider, Zedem Media.