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BrazzaB

if they could reverse the colour change, light during the cold night and dark during the day, they could use it to keep you warmer in the day (by absorbing more heat from the sun) and at night the lighter colour would prevent you from radiating heat away.

Better yet if the fabric was light triggered it would be dark on the bits facing the sun and light on the bits facing away.

For use in hot places the colouring would be reversed to radiate as much heat on the shady side as possible.

I seem to remember there's a desert chameleon that uses the same trick.

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