This shape, I can't stop drawing you. It's taken from a sketch of Christo & Jeanne Claude's 'Surrounded Islands' which looks like this: "6.5 million square feet of material was stretched over seven miles and used to surround a series of uninhabitated islands off the coast of Florida. The resulting work was visible from all around and visually augmented through the use of a shockingly bright pink." See more of this incredible installation here. Lots of sketches and photographs.