I wonder how they discovered that "clicking" works, seems so counterintuitive to discover. Though it's fair that I don't spend anywhere near that much time listening carefully and noticing how sharp sounds reflect.
> I wonder how they discovered that "clicking" works
I won't think it's they unexpected - have a walk a forest with loud insects. You'll hear a lot of interesting noises shaped a lot by what you stand near to. Large trees especially change how you hear things quite a lot.
