Cubism

Cubism derives its name from the French term "le cube"  or cube, a shape the entire style is based on, its is trying to create a building from  a composition of  cube like and geometrical, that is why purely cubism building in Prague have no curves what so ever.

While Cubism in painting was made famous by Pablo Picasso,

applying Cubism to  architecture it taught to be a Czech idea. Prague is one of the few cities where you can see Cubist architecture in the historical center.

Along with cubism, there was  another derivative of  of the same style called rondo cubism when it incorporated element of curved shapes .The Legiobank was the first  rondo cubist building, and it went on to spur what would be referred to as a  "national style", mostly used in the interwar period, when the first Czechoslovak Republic was founded, in 1918.