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1.
1. Point in an artist's career where they go batshit insane and start producing very abstract/ avant-garde pieces of art.

2. Excuse used when an artist has gone off the deep end and/or produces sub-par works.

(Note: I don't consider Cubism as a whole to be subpar in any way, and I am actually quite partial to it)
1. The song "Revolution 9" by The Beatles was probably made during their Cubist Phase.

God likely created this while he was going through his Cubist Phase.

2. "I'm sorry, Johnson, but we just can't put any of this art in our gallery."
"Please try to be understanding, Sir. I'm going through my Cubist Phase, trying different things".
by 581321 August 30, 2010