Shell structures. A shell structure has an outer layer and is hollow. Its outside layer is thin and curved. It has little or no joins where the different parts of the structure are connected together.

Similarly, Shell Lace Structure “celebrates lightness, strength and economy” by minimizing the use of material and creating maximum structural results. Save this picture! Courtesy of Tonkin Liu ...

Tonkin and Liu, founders of London-based architecture studio Tonkin Liu, adapted the design of their single surface structural technology – called the shell lace structure – to create the stent.