fun stackexchange answer i just wrote meditating on the surprisingly deep question of what it means for a shape to have an "inside" or an "outside"
math.stackexchange.com/a/3849614/232
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QC do you think a straw has one hole or two holes?
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Replying to
there's no such thing as a hole
"there is no such thing as a hole" u say, as you fall into an open manhole and break ur legs
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topologists know best of all that there’s no such thing as a hole