Cubism, which you can learn all about on Wikipedia or you can settle for the condensed version here.
Cubism is an early 20th century art movement. Where did all art movements start before Americans got into the thick of things? Why France, of course. And artists : George Braque & Pablo Picasso led the way.
In Cubism the visual presentation of space, volume & mass were achieved by using geometric forms. Above you can spot a good assortment of cylinders, rectangles, triangles, circles, etc.
To me cubism looks like art school assignments. But then these artists were conducting their own personal art school.