Back in the old days one way to test out a physical design was to build it. If the cost of building the real thing was too expensive then you'd model the shape out of something more cost effective, like clay. And to be sure, the hands of a professional artist can be very, very good. But using human hands to mold clay can leave a lot of leeway. What if you need some seriously rigid specifications for your model? What if you need accuracy down at the micrometer scale?

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