In my recent oval models, I have been combining segments of different sizes of circles. Here I’ve taken the same idea of combining portions of circles in a different direction. This corrugation is based on three equally sized semicircles that alternate directions like in the letter S. As the outer circles get larger, the inner circle gets smaller, and vice versa.
In this model, the outer edges were challenging to fold because there is not much tension to hold the paper in place. This design could be extended indefinitely as a series of repeating curves, or it could be combined with circles of other sizes to create a closed form like in my oval forms.