"Despite Color-Blindness"

Cuttlefish are probably nature's greatest camouflage artists and can change their color and even skin texture at will, despite the fact that they're totally color blind and can't perceive colors, either around them or upon them.   

Perhaps we physically change in a perceptible way based on our emotions, our thoughts, or our personalities, but we can't perceive it because we lack the sensory equipment to notice.  Maybe we do have auras, but lack the ability to see them.  We wonder what is it that we don't perceive, and how we would know?

Maybe this is why our pets seem to notice things about people that other people don't.