Architects know that some kinds of design problems are more personal than others. One of the cleanest, most abstract design problems is designing bri… - Paul Graham

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Architects know that some kinds of design problems are more personal than others. One of the cleanest, most abstract design problems is designing bridges. There your job is largely a matter of spanning a given distance with the least material. The other end of the spectrum is designing chairs. Chair designers have to spend their time thinking about human butts.