Images 1 and 2 hint at a legendary nonsense question often asked in Interviews.
Who is the mechanical engineer shown in the pic, and how does he fit into this equation?
Update: Don’t give me the funda for the two manholes, Just use that funda to think how the engineer is involved with this problem.
Cracked by Capt Vogon Jeltz & YaavanoObba (on twitter)
Any curve of constant width ( a circle, for example) can be used as an ideal manhole cover. So these are the only two 2-d surfaces that quallify.
The interview question made famous by Microsoft was along ‘lateral thinking’ lines, asking why square covers can’t be used instead.