A 3-D solid model of a jack inside a cube. Modeled and ray traced using <a href="https://en.wikipedia.org/wiki/Cobalt_(CAD_program)" class="extiw" title="en:Cobalt (CAD program)">Cobalt</a>. Animation is 120 frames at 25 fps.
<a href="https://en.wikipedia.org/wiki/User:Greg_L" class="extiw" title="en:User:Greg L">Greg L</a>
<a href="//commons.wikimedia.org/wiki/File:Jack-in-cube_solid_model,_light_background.gif" title="File:Jack-in-cube solid model, light background.gif">File:Jack-in-cube_solid_model,_light_background.gif</a>