"Nonlinear" doesn't mean "curved." It means "everything else left after you take out the linear". That's a huge inifinity of possibilities.
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Showing my ignorance, sticking to 2D first, when you take away the things that are linear and the things that are curved, what's left?
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piecewise linear things, affine things, random sets of points, self-intersecting jerky squiggles, non-smooth curves
for example, people don't realize that linearity implies f(0)=0. If it's a const and you can't move origin, linearity breaks.
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