Link to comic: https://xkcd.com/2821/

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I spent way too long trying to figure out why the guy and the ice cream shop were flying, and how he would move horizontally in he air…

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I couldn’t tell what I was looking at until I searched for an explanation. All I could see was a person falling into some water past a floating ice cream stall. It’s supposed to be a beach:

https://www.explainxkcd.com/wiki/index.php/2821:_Path_Minimization

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“we have a beach at home”

the beach in question

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Path that maximises time would be some kind of space-filling curve. Maybe it does that off panel?

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It’s to do with light paths and diffraction. The time maximising path still hast to be a valid path.

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