I was thinking the meaning of the caption was ray tracing light through the lens from a single point on one side. I suppose you could stick your head in a fish

I was thinking the meaning of the caption was ray tracing light through the lens from a single point on one side. I suppose you could stick your head in a fishbowl that is sitting on the ground to get the same effect, as long as there are no planes or manned spacecraft directly above you. Technically you can do that with a planar lens if you stick your eyeball onto the lens.