Sound. 3 down, 2 to go.
The question with hearing is: what makes it distinctive? What is its USP in the way it slices the universe?
Sound is like sight, in that it’s spatial and lets you build up an image of your surroundings, because sound moves pretty quickly and so you always know that the source of the sound is present. But sound travels a long way when it’s louder, and it’s easier for us to produce loud noises than bright lights, armed with just our bodies.
Sound is like smell in that you can’t really tell how distance something is, but you can triangulate it and move towards it and so on… but whereas a smell is generally produced without effort, sound is a sign of something alive – quite often – of something active.