But the sky usually appears blue. Sure the sky is not blue just as an apple isn't red or green, but to normal human experience, we see those colors when looking at these things.

:deep-thought:"Light" is simply one of many different kinds of electromagnetic radiation's (disturbances) that travel through the universe in the form of waves at a fixed speed of 2.9978x 10cm/sec in free space.

:deep-thought:Technically light is not color due to the fact that the electromagnetic waves in the wave lengths of visible light range from about 30/1,000,000 of an inch in the red end to about 16/1,000,000 of an inch in the violet end excite certain nerve endings in the retina of the eye, which then the impulses transmitted to the brain from those nerves give rise to the imagenation (sensation) of "color" & "light". (I didnt express the wave lenght's in units of angstrom's because I like the numbers 1,3,6,.)

:detective:So technically the sky is not blue, any color, or any other hue and science proved it to you.
(Also all humans are physicaly not any shade, tint, color, ect...)

*.*Physicaly colorless, thoughtfully colorfull, o sweet sweet duality*.*

:deep-thought:"Light" is simply one of many different kinds of electromagnetic radiation's (disturbances) that travel through the universe in the form of waves at a fixed speed of 2.9978x 10cm/sec in free space.

:deep-thought:Technically light is not color due to the fact that the electromagnetic waves in the wave lengths of visible light range from about 30/1,000,000 of an inch in the red end to about 16/1,000,000 of an inch in the violet end excite certain nerve endings in the retina of the eye, which then the impulses transmitted to the brain from those nerves give rise to the imagenation (sensation) of "color" & "light". (I didnt express the wave lenght's in units of angstrom's because I like the numbers 1,3,6,.)

:detective:So technically the sky is not blue, any color, or any other hue and science proved it to you.
(Also all humans are physicaly not any shade, tint, color, ect...)

*.*Physicaly colorless, thoughtfully colorfull, o sweet sweet duality*.*

:shifty:It's a tricky statement which can be technicaly proven by meany mean's.

:detective:Stand on the roof of a skyscraper and look off the side at the ground. Surly sky between you and the ground is not blue or any other color.

Its blue. I know it because then I look up I see the same thing from wich the sky bellow is made, and I know its blue

You need a good memory in the UK to know the sky is blue.

Saying 'the sky is blue' is the same as saying 'the wavelength of electromagnetic radiation scattered roughly vertically downwards from the atmosphere toward the Earth's surface lies roughly between 450 and 500 nanometres'. So the sky is blue.

I read somewhere that art experts have claimed a certain blue it appears was invisible to medieval man.The chemistry of the artist could have produced this colour but they never used it.It was a kind of magenta, i believe.
It makes you think did we recognise colours more clearly when we started appreciating beauty.We needed colour sense to distinguish poisons and subtle changes in shades of fruit.We might have learnt to recognise more and more the slight changes in shades of colour as we became more responsive to our surroundings.Just a thought.

I the perception of blue is linked to the wavelength range 450nm to 500nm by our consciousness. I do not think that wavelengths carry the property of colour. If it did then what is the colour of radio waves or gamma rays? If light coming from a source at the event horizon of the black hole, is percieved by an observer far from the black hole, as redshifted to infinite wavelength, what is the colour of an infinite wavelength?