>No one ask Van Gogh to paint another Starry Night, man. (It is this quite, oft-repeated by my parents, that makes me thinks Jodie Mitchell is a true genius).

That's because he wasn't that famous when he lived anyway. If he had any success, art dealers would ask him to paint "another Starry night" all the time.

Besides, it's not like his work is composed of paintings entirely unlike each other. In that sense, he already has like 10-15 Starry nights.

(Constrast with Picasso, who had several entirely different periods of work).