I started to introduce letters into my pictures [his first collage art]. These were forms which could not be deformed, because, being two-dimensional… - Georges Braque

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I started to introduce letters into my pictures [his first collage art]. These were forms which could not be deformed, because, being two-dimensional, they existed outside three-dimensional space; their inclusion in a picture allowed a distinction to be made between objects which were situated in space and those which belonged outside space [the letters].