Valensi's "symphonie verte" was also a lovely Deco-y thing. Dammit, I can't find any links to the cool art, when all the Kandinsky's and Kupka's were Krap.
Moving away from static art, the coolest thing of all was the Piano Optophonique invented by Baranoff-Rossine in 1922-23. It's an electromechanical player piano/magic lantern show. It is clearly the work of an insane genius. Magical in an insane steampunk sort of way.
Moving on, there are many experimental art films. Many are wankery, but some of them are pretty cool. The best of them could easily be inserted into either the 'trip' in 2001 or "the Music of Erich Zann" and improve them.
I think it is mandatory to organize a flashmob to assemble on free-Thursday at MOCA in this 'artwork'. At the stroke of noon, we all bust our best moves.
This thing is shallow, but physically imposing and impressive.
The permanent gallery is crap, though it does include taxidermed poultry.
Oh, the fountain in Pershing Square is still green from St. Paddy's Day.