"The reason why research is like sculpting from memory is that in neither is there a concrete visible subject to copy directly. The subject - as sculptors themselves are fond of saying - is hidden in the block of material."

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It would be very curious to record by means of photographs, not the stage of the picture, but its metamorphoses. Perhaps one would perceive the path taken by the mind in order to put its dreams into a concrete form. But what is really very curious is to observe that fundamentally the picture does not change, that despite appearances the initial vision remains almost intact.

— Pablo Picasso