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I had a most fascinating class when I was in University, all about vision and its processes.
Did you know the sky should actually look violet to us and not blue?
The light from the sun is a mixture of all colours in the spectrum, ranging from shorter to longer wavelengths - that is how colour can be detected, scientifically. Shorter wavelengths are more easily detected, as they are scattered more strongly. The shortest wavelength is violet, so it makes sense that we would see the sky as being that colour.
Due to a number of factors, including the fact that the human eye is less sensitive to shades of violet (containing red), we end up seeing the sky as blue.
Isn't that a curious thing?
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Whether we write or speak or do but look
We are ever unapparent. What we are
Cannot be transfused into word or book.
Our soul from us is infinitely far.
However much we give our thoughts the will
To be our soul and gesture it abroad,
Our hearts are incommunicable still.
In what we show ourselves we are ignored.
The abyss from soul to soul cannot be bridged
By any skill of thought or trick of seeming.
Unto our very selves we are abridged
When we would utter to our thought our being.
We are our dreams of ourselves, souls by gleams,
And each to each other dreams of others' dreams.
Fernando Pessoa, 1918
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