Some examples:
A ring slides on but gets stuck trying to take it back off.
A kid puts his head through metal slats on a railing, but can’t pull it back through.
A girl gets her body in a clothes dryer, but can’t get back out.
If we can fit forward, shouldn’t we be able to fit backwards, too?
In: 358
Think of the head.
The chin is kinda like an arrow, and it can easily push through places, if a railing isn’t 100% rigid it will usually bend a little sideways, making the opening bigger.
On the back of the head though, you got the chin, going back out, it doesn’t push the railings sideways, it pushes them straight back, so the bend won’t make the head fit.
You also have the ears, which when going forwards will be squished against the head to make space.
When going back out though, the ears will be pushed forward, which will make them overlap with the other part of the ear occupying more space.
These two together means that it will be hard for the head to come out, so there will be some cases where its possible to go in but not out, and least not by simple pulling/pushing.
On cases like cave divers, its different but similar principles.
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