Inside The Rainbow
I see that you’ve got your wet weather gear on this morning which is just as well looking at those clouds covering the mountains. I’m not sure we’ll get down to where three valleys meet but never mind; seeing that beautiful rainbow pouring itself into the village of Agios Ioannis gives me an idea. We’ll see if we can find all the colours of the rainbow reflected in nature. I say ‘reflected’ advisedly for the colours that we see are mere reflections which we should be able to illustrate as we go along but first, have you ever stopped to consider how we perceive colour? It’s all down to cone cells in our eyes. Back in 1672 Sir Isaac Newton first discovered that light was made up of different colours when he recreated a rainbow with a prism. If you could slow light down you could see that it came in waves, like the sea crashing onto the shore, but whereas the distance between the crests of the waves in the sea may be several metres or more, waves of light are infinitely smaller (about 4-7 ten millionths of a metre) and the different colours have different wave lengths. This is where the cones come in. We have three different sizes: one for catching the longer red, orange and yellow wavelengths; one for the medium green; and one for the smaller blues, indigo and violets. These send electrical signals to the rest of the brain telling how much of each they’ve collected and the brain then combines these signals, like an artist with a palette, to give us the colours that we visualise.
Read on at https://niume.com/post/219805
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