Amos,

The fishbowl itself is nonobservant. It can allow light to pass through, and it can reflect light.   It does not, however, 'see' anything. The fishbowl also acts as a lens and therefore always distorts, in some manner, what the observer sees, whether the observer is inside of the fishbowl, or outside of the fishbowl. It is very useful to switch places with some frequency. That is our best bet for identifying the distortions inherent in either perspective.

'Course, now we have Rapaire seeing doubles.