Even given that I firmly believe in the human brains' adaptability and cognitive capacities, I must admit I didn't expect it is possible for a regular person to see the world just as the bats do, via echolocation, with normal human ears.
Mind-blowing.
And you don't need to be blind to do this, either:
> ten sighted subjects were taught basic navigation skills within a few days (Wikipedia)
https://www.ted.com/talks/daniel_kish_how_i_use_sonar_to_navigate_the_world/transcript
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