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Which the point, both pizza and painting must conjure desire, edible or erudite. There's some fun in that world: imagining a Rothko you can take a bite of. At base, both P formats touch on some primeval instinct, desire. The switcheroo of painting's distanced judgement with the less socially clouded appreciation for pizza makes the point a bit clearer - there is a less than high basement to our admirations. There will be no food critic telling you to enjoy worms on your pizza, but there is always an art critic who will.