I suppose that simultaneity would be the defining "geometric" feature of cubism. Relaxing the constraint on forms following their relative real-world positions and orientations (as Egyptian art did in representations, especially of the face) and relaxing the constraint on the wholeness and singleness of views of objects are both hallmarks of sumultaneity.
Simultaneity is a method of composition or projection, both of which could be considered geometric, but I still don't think that geometry the best word for it. Even where the forms are faceted (as in analytical cubism), there's a haphazardness about it all that would mean any geometry used would have to be postmodern. :-)
You can talk about the picture plane and how cubism affects that but I don't think it makes sense to do so, that's a very limited reading. You still have a picture plane, t's just what's on it that changes...
- Rob.
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