The Wii is a rectangle because the system produces pretty much no heat, so Nintny ompressed it into as small an area as they could because of their wish to see a Wii next to every tv, rather than just those who care enough to have a system hogging space.
Also, more technology should be white. grey is so 90's, black is so 2000-2005. Apple and Ninty are taking us into the future