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This bowl is base on Boy's surface, one of the trickier mathematical surfaces to visualize. In this model, the spherical end has been opened up to make it easier to see the internal surfaces and so that you can use it to strain your pasta :)
Boy's surface on Wikipedia:
https://en.wikipedia.org/wiki/Boy%27s_surface
See video here:
https://youtu.be/x6B0zxCWoyE
