How did Picasso come up with the idea to create the cubism art style?

Cubism is an artistic movement, created by Pablo Picasso and Georges Braque, which employs geometric shapes in depictions of human and other forms. Over time, the geometric touches grew so intense that they sometimes overtook the represented forms, creating a more pure level of visual abstraction.

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the above mentioned statements talks about the creativity of an artist and to what extend they can utilize and experiment on the objects provided.   differing size and subjects are given so that an image of wisdom is created. displaying a transition from light to dark in something by darkening sections in order to create a shadow. and lastly, putting bits and pieces together to formulate a new image.