PROTIP: Press the ← and → keys to navigate the gallery, 'g' to view the gallery, or 'r' to view a random video.
Sep 08, 2013 at 02:18PM EDT
How do I know that the color I see as blue is the same color that you see as blue?
Sep 08, 2013 at 06:05PM EDT in reply to S1MP50N
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