Abstract: Spincoating is a decades-old technology for making thin polymer films, and is in turn a spin-off of the centuries-old technology of the potter's spinning wheel. It is one of a small handful of technologies for manufacturing-scale processing of polymer films. Make crystals with micrometer to nanometer lattice parameters using colloidal self-assembly is promising as a way to make photonic or magnetic materials. I will describe the unusual structure and dynamics of self-assembly when one drops a colloidal suspension on a spinning wheel.