I have encountered this sentence in some form or another in several sciences journals-articles or sometimes in the social media bio of random strangers. I get a gut idea of what it is, but I’d like this explained in detailed words, so that I might also be able to explain this to someone, if prompted.
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[Here](https://www.youtube.com/watch?v=ls_66dIM9-4) is a YouTube video of a computer simulation of shining a laser through three rows of reflective round pegs. [Long version](https://www.youtube.com/watch?v=_s4NLA8aAgw).
The geometry of angles and positions means any change in the laser angle gets amplified every time it bounces off a peg. So with multiple bounces, you get to a point where variations of like the 10th decimal place in the laser’s initial angle cause its path and the point it exits to be completely different, jumping all over the place.
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