Apparently, some 530 million years ago (give or take) in the #Cambrian age, after about 2.5 billion years of rather plodding #evolution, bi-lateral symmetry appeared in animals (after some dabbling in tri-lateral and penta-lateral symmetry) and when brains showed up they were bi-lateral. #Vertebrate, but still #jawless, fishes were swimming after each other for lunch. #Eyes, which had already existed for a long while, started showing up in pairs, at the head end of the fishes. (1/3)
Small pupils when the sun was shining...
Large pupils when the clouds rolled in...
G.
Blind red.
Eyes, blinded by red.
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