When I was using POV with "isosurface", I made the air as a transparent substance and the object as a hollow casually. I found the result interesting and tried with various ways. The images show somehow a paraspace. How do you think these images? It can be said that this page is one of recent mirror series.
I made this image with a rectangular parallelepiped and a spherical hollow.
Scene file : lpmlsphr.txt
Multipled Sphere / 23k / May 2005 / by Tsutomu Higo
I made this image with a rectangular parallelepiped and a spherical hollow, too. But I enlarged the width and the depth.