For a more in-depth discussion on 4 dimensional geometry, I highly recommend the Dimensions films[1], which are available for free download. It's a little bit m

For a more in-depth discussion on 4 dimensional geometry, I highly recommend the Dimensions films[1], which are available for free download. It's a little bit mind-bending, so to speak. [1] http://www.dimensions-math.org/Dim_E.htm http://www.dimensions-math.org/Dim_E.htm