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If this would be my desk, where should i put the coffecup?
Obviously you would use a Klein bottle.
en.wikipedia.orgKlein bottle - Wikipedia
Klein's bottle: the reason why the topologist died in the desert.
They tried to fill it with water, but every time they poured some in, it was out.
I thought he died because he mistook his water cup for a doughnut and ate it.
@yours_truly @mina @number6 it is the only drinking vessel where I think it is not only appropriate, but also reasonable to use a straw not only to drink, but also to fill it
That looks like a good idea for space travel - would surface tension be enough for the liquid to coat the bottle, and it could just be licked off, instead of those pesky globules floating into critical electrical circuits.