Art that's so bold, it's almost... cubical. Cubism: the art movement that's all about breaking the rules and making a mess.
Started in 1907 by the likes of Pablo Picasso and Georges Braque, Cubism was all about rejecting traditional techniques and embracing the chaos.
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Or, if you will, the Brutalist cousin of Cubism: the art movement that's all about making a mess, but without any of the fun.