"As a consequence, I think of the idea of 'common practice' at any time as something that can only be seen by looking backwards. Maybe around the turn of the 20th century there might have been some kind of common practice but now it looks to me like the boundaries have come down."

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Only in the 20th century, artists started taking the study of perception in a more humane way. They were thinking about the eye as being an instrument, the whole body as being a visual instrument. That sort of gave way a little bit with Cartesian­ - the "Cogito ergo sum" argument. It's not, "I think therefore I exist." It's, "I feel therefore I think therefore I exist."

— Vik Muniz