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In the neighborhood - Pg. 43

Q.31: Can you infer fencepost (or bridge*) ``shapes'' just by walking past them? Okay, the question is somewhat unusual, but by shape I mean the cross section of each post. I've now left the house behind, and have an unusual inverse problem to consider. When walking around the neighborhood or driving in the countryside, you will see various fences on the side of the road, some of which may be made of posts with rectangular cross sections, and others with circular cross sections. Of course, if you are driving at more than 5 mph it's probably not easy to tell one from the other, and why would you want to