Say a saddle, and it's not infinitely large.
Would you get a different shape if you only connect the two opposite ends verses connecting all 4 opposite ends?
Would you get a different shape if you only connect the two opposite ends verses connecting all 4 opposite ends?
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If you connect two ends I think you get a cylinder, and if you connect all four ends you get a torus. But I'm not 100% sure on this!