Knitting Lace Triangles Author:Evelyn A. Clark Why Triangles? Visionary R. Buckminster Fuller called triangles the basic building blocks of the universe. He might not have been talking about lace triangles, but they are basic in the knitting world. Lace triangles are versatile accessories. They can be knit in a variety of fibers & colors, as well as tweed, heather and glitzy yarns.