The timing, level and tonal differences between two ears that let you point at a sound with your eyes shut — with the actual numbers, which show that level is doing far less of the work than a pan pot implies.
Close your eyes and someone claps to your left. You point at them immediately, and not because sound carries any directional information of its own — it does not. Your brain is running a continuous comparison between two microphones bolted to the sides of your head, and everything panning, stereo recording and spatial audio does is built on top of that comparison.
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