This simulation looks like the evolution of the Universe near the initial singularity (the so-called Big Bang).
The Universe during the Kasner epochs (an epoch is a straight line between two rebounces)
is described as a ball bouncing between the walls of a billiard whose curvature is initially negative
(lower left picture: the trajectory is chaotic) and becomes positive (upper right picture: the trajectory is quasi-periodical) later.
The consequence is that the initial state cannot be known...
(CMAP28 WWW site: this page was created on 12/18/2002 and last updated on 07/28/2020 11:41:10 -CEST-)