Well, it’s not exactly natural, but when I walked by this construction site, the yellow netting caught my eye.
The shape of the netting definitely put me in mind of a paraboloid.
But maybe I’m just looking too hard.
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Shouldn’t it be some kind of catenary…oid?
Shhhh…..
Well, fine, if you are going to spoil it, the least you can do is generate an appropriate image / equation.