this one is my try to get (nearly) realistic tiles. maybe they could
be found in ball house.
tiles are made with bumps. height_fields are bumped, too. 
height_field on the left side is created with Gimp's brush "showing
finger". who will believe it? 
image is conerted to jpeg to make it smaller. POVRay creates PNGs with
> 1mb. will there be a output format for JPEG2000 in following
POVRay-versions?

any thoughts, suggestions to make it better are welcome.

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