What's going on?
In this picture, where there is shadow your brain expects the colour to be darker, so you see a lighter colour - in this example the brown in the shadow looks orange.
Image reproduced with the permission of Dr. Beau Lotto
In this picture, where there is shadow your brain expects the colour to be darker, so you see a lighter colour - in this example the brown in the shadow looks orange.
Image reproduced with the permission of Dr. Beau Lotto