# Carlo H. Sequin

My 2017 art submission complements my Bridges conference presentation: “Homage to Eva Hild.” Inspired by the work of Eva Hild, I have developed some auxiliary CAD programs and design processes that make it easier to model her undulating free-form sculptures on a computer, so that similar looking maquettes can be fabricated on a 3D printer.

A majority of Hild's sculptures are two-sided, orientable 2-manifolds. My goal was to design a non-orientable 2-manifold sculpture, like a Möbius band, that, by its style, would fit into Hild’s family. A good starting point was Dyck’s surface (an elliptical disk from which two two tubular stubs protrude on opposite sides). A cycle of an odd number of such elements will produce a single-sided surface.

The key element here is an elliptical Dyck disk, from which two tubular stubs extrude on opposite sides. Five such elements of varying sizes have been connected into a cycle to yield a single-sided surface matching in style some of Eva Hild's sculptures. To ease the transition from the smallest to the largest Dyck ellipse, a spherical nodule has been introduced, as can be found in Hild’s “Hålrum” sculpture in Vaarberg, Sweden.