I began playing with this scene, with no particular final result in mind, so it
has developed on its own.  But in the end, I decided I'd like to have the
caustics of light reflected from the water playing on the bottom surfaces of
the canyon, so I added photons.  I've never really played with photons, so I'm
hoping someone more experienced with them might assist me--I'm not getting
quite what I hoped for.

I used standard photon settings.

You'll notice strange artifacts along the walls of bright specks--they do not
appear until both photons and radiosity are turned on.

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