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Or, for those not math-inclined, like a triangle that's been inflated.

Despite the shape, covers do regularly fall into drains. Sometimes the collar that the cover sits on breaks. Sometimes the cover does. Though they are very heavy and very strong, they're cast steel, so they'll break instead of bending if too much weight is put on them.]]>Dec 1st 2006 1:50AMhttp://www.luxist.com/2006/09/01/manhole-cufflinks/http://www.luxist.com/2006/09/01/manhole-cufflinks/Sep 1st 2006 5:43PMhttp://www.luxist.com/2006/09/01/manhole-cufflinks/http://www.luxist.com/2006/09/01/manhole-cufflinks/Sep 8th 2006 8:55PM