So say the colour of the sky today is blue. Why when we look sideways do we not see blue. When we look up we see blue, but its not the same when we look sideways, only when we look to a distance, over the horizon. If you have ever looked out of the window in a plane u will notice that it is blue outside, but only once you get high enough. So why when we look sideways is it not the same colour as when we look upwards, and what distance does it have to be to start looking blue?