Won't Miss #456 - helter skelter street layout/addressing

One of my students told me that Tokyo has a labyrinth of small streets snaking all around and carving the blocks up into triangles and trapezoids because those streets were once small waterways and streams that helped the locals conduct the business of living with a steady water supply. I'm going to take her word for that as I have never researched the history of the topography of Tokyo. I