I noticed when I was younger that I can "hear" when I'm near a wall, or just generally get a sense of the size of space I'm in solely via sound, but it never occurred to me to make a "ping" to sense the resulting sound reflections! Super interesting - I will have to try this. Probably my prior spatial sense from hearing was based on really subtle background noise of either my own footsteps or just environmental sounds reflecting around, I guess? I always felt like I am "hearing the room I'm in" but never quite knew how else to describe the sensation, but knowing people quite literally make a clicking noise to echolocate suddenly makes it much more clear!
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