Each welded-metal roll Zieta used in the V&A installation was up to 98.5 feet long and eight inches wide, proportions he arrived at by way of thorough stability testing. Laser-cutting and welding a piece the length of two basketball courts, however, wasn’t so much of an issue. “You can’t make everything in FiDU — we have very strong production process rules — but scale isn’t really the constraint for this technology,” Zieta explains. That said, the factory’s machine-building specialists did have to create a special tool for actually rolling the sheets as they were being welded, seen here.