do you ever want to use an illustration from a book so badly

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it's the hole in a hole in a hole from Spivak's differential geometry btw

you may know it from the numberphile video where a guy finds the canonical form of this surface blowing glass

aaaaaaaaaa i don't want to just use the image as-is even if this is just for internal use

loos v rough anyway so if anything I will use this as a starting point

thankfully this is a topological space so rough edges are forgiven

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