I just went through the POV-Ray help and found this in the section about
"no_image".
"When no_image is used, the object will not be seen by the camera, either
directly or through transparent/refractive objects. However, it will still
cast shadows, and show up in reflections (unless no_reflection and/or
no_shadow is used also)."
There you go. The object is not supposed to be seen through
transparent/refractive objects.
