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![](https://lemmy.world/pictrs/image/d82718c7-5579-4676-8e2e-97b4188f10d3.png)
Assuming we shrink all spacial dimensions equally: With Z, the diagonal will also shrink so that the two horizontal lines would be closer together and then you could not fit them into the original horizontal lines anymore. Only once you shrink the Z far enough that it would fit within the line-width could you fit it into itself again. X I and L all work at any arbitrary amount of shrinking though.
I was guessing at a duel vs dual joke, but civil war makes more sense.
Although they’re essentially the same joke in different clothes.