The functional processing of the human brain mainly occurs on the surface, in the grey matter. The grey matter is highly convoluted and varies considerably across individuals. This complex folding and individual variation makes it difficult to compare and understand how the brain functions. In this seminar I will present how I am using circle packings to create quasi-conformal flat maps of the human cerebellum and compare brain function across subjects. Some of the topological and computational problems that arise will be discussed and quasi-conformal maps that display the functional activation of the cerebellum will be presented.