O
	Meret Oppenheim (Switzerland)[1913 - 1985] b. Berlin, d. Bern
	http://www.omkonst.com/04-oppenheim-meret.html "Skull", 1964, x-ray
	Hanno Otten (Germany)[1954] Köln
	http://www.artnet.com/Magazine/reviews/robinson/robinson2-18-17.asp colour field filter works at Janet Borden/NY
	http://www.janetbordeninc.com/artists/index.php?page=Otten enlarged colour filter compositions and superposition on ilfochrome
	http://www.marciawoodgallery.com/inventory/inv_h_otten.html "Untitled", 2002, colour filter clichés on ilforchromes
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