This Math Circle focuses on the concept that classical composers incorporated variations on themes in their compositions just as mathematicians create them in their work. Isopmorphic problems appear dissimilar on the surface, but have the same underlying structure. We’ll try out some traditional river-crossing problems, and and attempted to solve them. Then we’ll try some problems that are not about crossing a river, and compared and contrasted them. Finally we’ll try to create our own isomorphs.