> So I changed the pretrace_end to 0.002...
...
> ....and increased error_bound to 0.1 - aside from the scene now
> rendering somewhat faster, I found no advantages, there are still the
> same annoying artifacts (see below)! Perhaps I really should try the
> ambient sphere...

What you really should try is POV-Ray 3.7 - radiosity has changed a lot 
since 3.6.

You'll probably need to increase the radiosity count parameter at any 
rate though; the irregularities seen on the walls indicate that POV-Ray 
doesn't "catch" the bright patches of sunlight on the floor reliably.

In case render times increase unacceptably, there are some ways in 3.7 
to counter this increase to some degree. (In particular, you can define 
fully transparent objects to "mark" the patches of sunlight, set to 
"radiosity { importance 1.0 } no_image no_shadow no_reflection", while 
you set the walls to "radiosity { importance 0.1 }" or some such.)

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