This came in a dream. It is free for your use.

Five rectangular tanks of water, each about one meter deep, five feet wide, ten feet long, and open, stacked on top of one another, with a small gap in between for air to pass. Some kind of minimal struts holding them up. Each one is chock full of plant life: leafy and cactusy, but not choking with seaweed. In the center of each tank is a fragile, rounded, glass bowl where a catfish (two feet long) makes its home; the catfish is free to swim throughout the tank. In one of the tanks, a middle-aged man, just greying, sits still on a chair, eyes level, head above water. From time to time the man climbs out to take a break. Display in a a public place where people can watch from various heights. Should last for several days.