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0 vs null vs undefined - explained with toilet paper
(i.stack.imgur.com)
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I knew someone that had the null set tattooed on felt they had made a deeply philosophical statement by doing so.
+INF - a landscape covered in toilet paper out past the horizon. It probably ends, but nowhere you can see.
I have no idea how to represent negatives.
Edit: Subnormals - less than one square is on the roll.