Curvy stuff is difficult for people to understand. Had I taken a calculus class earlier in my life, this fact would have been blatantly obvious. When drawing directly from a model, edges are indistinct and there are all sorts of subtle foreshortening. In time, you learn how to, in a sense, "not draw" what's not there, which is often the secret to allowing the curve structures to emerge in the drawing. When it comes to coding, curves again prove especially challenging, and often require a more "mathy" approach than when working with lines. Processing does makes it relatively easy to generate simple curves, but being able to precisely control a combination of curves to create a form such as a human figure is very difficult.

That being ...

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