Chevron Corrugation (UD-DU variant) — top-down view
This is a new variant of my Chevron Corrugation.
Since this variant is iso-area, just like Iso-area Chevron Corrugation, and there are some more variants which share this property but are still different, I had to come up with a naming scheme. All the different variants of this corrugation consist of rows of chevrons, some of which may be pointing up while others are pointing down. I mark these cases as U and D, respectively, and a dash means moving to the next row. The sequence which describes the variant shown here is UD-DU, and this 2×2 “supermolecule” described the whole pattern which can be tessellated indefinitely. Similarly, the original iso-area variant would be described by UU-DD, and the plain, non-iso-area variant would be just U.
This corrugation was designed by myself while the basic, non-iso-area variant was invented independently by Daniel Kwan before me, and his work in turn was based on an industrial design by Charles Hoberman. Read more of this interesting story by Daniel here.