A visualization of two physical models of gravity: Newtonian Gravity and Einsteins General Relativity.

Based on illustrations from the book «Relativity Visualized» by Lewis Carroll Epstein:
archive.org/details/L.EpsteinRelativityVisualizedelemTxt1994Insight/mode/2up
and from the doctorate thesis «Gravity Illustrated» by Rickard Jonsson:
www.relativitet.se/Webtheses/tes.pdf

An interactive diagram of curved space-time at a larger scale, including the interior of the massive body:
www.adamtoons.de/physics/gravitation.swf