I have always considered the cubism movement as the movement that breaks all the rules, at least visually. When you first begin to learn how to draw the first thing they tell you is that you need to learn how to see. You need to learn how to replicate what is directly in front of you on a piece of paper. You step away from drawing from memory and learn to truly draw what is in front of you. Cubist artists learn all of the rules. They learn how to replicate things and how to draw amazing realistic subjects to then break all the rules and transform the subject matter onto geometric planes.
At first it seems so simple. You draw everything on flat planes. But cubism is so much more than that. You need to understand the object and then deconstruct it to fit the planes and shapes of your choosing. Pablo Picasso and George Braque are the fathers of cubism. They took this movement and ran with it. They learned to control their visions and learned how to leave an image deconstructed. Their art pieces captivate you with all the geometric shapes and how your brain has to work backwards. You have to put all the pieces together visually to understand the subject matter. Even within the smallest plane of their pieces there is so much you can get lost in. Cubism gave them an opening to play with collage. They used collage to play with shapes and imply certain things without directly drawing them. Like I said at the beginning Cubism breaks all the visual rules, but that does not mean we should underestimate the work. In order to break the rules you should still learn the rules to fully understand something. So next time you see a piece form the cubism movement take some times to think about all the work that was put into the different planes of the piece.
Daisy's Look into Graphic Art History 