The holographic principle (applied to the universe) maps the information contained in the 3D volume of a sphere with arbitrary radius "r" onto the surface of the volume. The mapping is from three dimensions onto two dimensions. As I understand it, the suppressed dimension (assuming spherical coordinates) is "r". Regardless, we live in a 4D universe; does the time dimension remain? Given that the information within the sphere is constantly changing, is "time" manifested as time varying information fluctuations on the surface of the sphere? What would that look like?! [xx(]