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I used to get this as a kid mowing the lawn on a riding mower. After a couple hours, when you get off the mower the whole world seems like it's receding from you slowly.

Oh my god, I had the same thing happen to me! I had bad eyes from a young age, so I always just attributed it to that... Neat. Makes sense.

After being a scuba diving assistant to instructor thru one summer, I had similar effect after spending close to 10 hours under water every day for weeks: when I lay down for the night on a flat bed and open my eyes, the whole ceiling would float like a water!

This has be somewhat depicted in movie "The Big Blue" https://youtu.be/82onGmBx9ZM?t=74

This naturally happens in an automobile as well after driving the stateside highways long enough.

This is called "velocitation"

https://driversed.com/resources/terms/velocitation.aspx

Trees outside were moving in the wind. Wasn't clear to me when the effect stopped...

This is crazy. Feels like it was revealed that my brain is no different than the AIs creating trippy art that Google made a while back. They just had a longer stare

Eerily similar to one aspect of mild psychedelic trips (wavy-ness)