Just playing around here.  Made a disco ball by intersecting a bunch of 
planes then made two spotlights pointing at it and shooting a ton of 
photons.

The only problem with it is that in order to get caustics to show up 
with more facets on the ball is to set an insanely high photon count. 
Otherwise, the walls just get some brighter, but still very dim, patches 
  of light, rather than the bright spots.

-DJ

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