Interesting discussion here, but the first thing that comes to my mind is - we may well see the sky as blue, but how about our animal neighbours we share this place with?

How do they see the sky? Insects for instance, is it a blue expanse they glimpse, or some sort of yellow wonder? Or is it in various shades of gray?

It would be interesting to know how other animals perceive the most common sight on the planet.

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"All truth passes through three stages. First, it is ridiculed, second it is violently opposed, and third, it is accepted as self-evident." Arthur Schopenhauer - renowned 19th Century German philosopher.