I am making a large room with marble walls. I am having trouble getting a
texture as detailed as marble look nice at a far distance. I made a simple
scene to demonstrate the problem:

#include "colors.inc"
#include "stones.inc"

box{0, 100 texture {T_Stone27}}
light_source {50 rgb 1}
camera {location 1 look_at <0, 0, 50> }

With no antialiasing, this looks terrible. It's not much better with +a0.3.
The only way I can get it to look half-decent is with +a0.0 +am2 which
takes a very long time to render, and still has a fake, drained-out look
about it. How do I make a detailed texture look nice even from far away?

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