Refraction of light in water
How deep is the pool? Really looks like it is super flat, doesn’t it? It’s not, it’s almost shoulder-deep (if you aren’t taller than me ;-))
Even though I’ve known about the effect since I was a small child and we did this kind of experiments, I still find it super fascinating to see a pool like that one, climb in and confirm that both ends are, in fact, the same depth. Don’t you?
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