Rerendered at 800x600 with slightly improved lighting.

Sorry for starting a new thread but Thunderbird insisted on
sorting my original "Rainbow" post into a thread from 2008
using the same title.

While testing I also had the curious effect that I got additional
caustics from the glass when *removing* the window pane. I really don't
quite understand how this can affect anything, the window pane uses
photons {pass_through refraction off reflection off collect off}.
The water glass is the only photon target in the scene.

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