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This wouldn't explain why the same effect was seen from photos of graffiti (which presumably were outside, in the day.)

"When someone told him that it was probably due to the colors of flesh in photographs, he tried it with a pool of graffiti. Still orange. "

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I'm curious how much exposed wall was included in those pictures. Graffiti is vastly more common on brick and concrete surfaces, which 99% of the tie are red, yellow, cream, or gray. Regardless of what color the graffiti is, if there's a lot of backdrop behind it I'm not at all surprised that it'd average to orange.

Pick something else like "pictures of forests" instead of "pictures of graffiti" and suddenly your average stops being orange because you're not taking photos of buildings anymore.

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