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horizon, august ‘11

i made this picture on the flight from cairo to geneva (CH) on my way back home from china. ill post some china shots as soon as i find the time and motivation to “curate” them. this shot here made me think a bit. its actually just a horizon with ocean and sky. but the fact, that both are blue made me question why it is like this. would you recognize the difference between ocean and sky, if you wouldnt know? so i decided to turn the picture 90°, but in which direction? so which side is the sky and which the ocean? and why is it blue?