It's an old (probably 1930 - 1950 sometime) instruction film showing all symetry axises/planes in a cube (and there is lots of them), using a physical model of a cube, and a mirror placed in the symetry plane currently beeing shown. It is shown (or at least, it used to be shown, as part of the "n0llning" at EE, KTH.

I guess what you've done was more theoretical? :-)