I just bug reported that you can't camera-zoom at the inside surface of a hollowed prim.
Try making a one-prim room, using a single 10 M x 10M x 5M high prim hollowed to 95%, and stand in the middle of it. Texture the inside of the hollowed prim different than the outside.
Now try to option-click to focus on the inside wall, and zoom in on it.
Your camera viewpoint gets thrown OUTSIDE the prim. You can only zoom at the exterior surfaces.
You can aim the camera at yourself just fine. Or at a solid prim inside the one-prim room. But focus on the interior surface of the hollowed prim, and BAM, you're outside!