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Perhaps different artists were doing different things with cubism at
different times. I suspect that M. Duchamp was definitely using it to show
Picasso on the other hand may have been using it (at times) to show
different emotional states (mho). Then we have Mondrian's "Composition"
pieces and all the various cubist still life's.
I really feel that the artists used it to suit their purposes at
the time and no one "rationale" if you will, suffices.