Can someone show me how to fold the magenta plate to become the blue one?

Yes. I was refering to @anon39580149 's method. For flowing a geometry along a Curve, you need a base curve (Reference Curve) and a target curve . It’s just the matter of positioning these curves in the right place. If you can manage to open the grasshopper, the rest is easy since you just need to alter the slider value.bend_Re_2.gh (43.1 KB)