How about a Stack Overflow coffee mug. Big.
We wouldn't expect it to be as professional as these diagrams, but we could only hope ....
Image may be NSFW.
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We could even have them mooded on either side.
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Much like the Salieri fantasy of Mozart's father:
Image may be NSFW.
Clik here to view.
Image may be NSFW.
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Please.
Or we could use this amateurish design by BlackT
Shhh please be nice, they've worked hard on trying to keep up with my standards
Image may be NSFW.
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Please be mindful we have a theory of mathematics riding on this post. We like to keep the
number of upvotes == number of downvotes.
(not that I'd be telling anyone how to vote, as that would be bad).
Theory of mathematics being tested live on Stack Overflow