Living things have eyes to respond to light coming from the sun. So the brain has evolved to interpret light as colors and hence picture the world. Do you think living things could have evolved to see sound. More vibration corresponding to different color, less vibration corresponding to other. Although seeing light is much better than seeing sound but this is possible right - seeing sound? I am not saying that seeing sound should have occurred but just asking whether such a natural phenomena could happen Hope question makes sense. Thank You!