I'm not sure how excited you are about shapes, but I really like working with them. These shapes have yet to be used for anything constructive outside of their own construction, but I guess they serve the purpose of showing how well circles, squares and triangles can get along. Rectangles are kind of left hanging out on the cusp of these groups, but rectangles are solitary creatures, not bound by so many laws - they are the free birds in the sky of simple geometry - or the bastard children of squares and mongoloids that bare majority resemblance to their pure fathers, and take only the exaggerated length of their longer sides from the tainted blood of their less uniform progenitor. Either way, I still like rectangles.