Perspective “Viewing Rooms” 3rd/4th grade

I teach one-point perspective every year to the 3rd/4th grade class.  In the past couple of years I typically have taught city perspective drawings.  I thought making aquariums or viewing rooms would be a fun twist on this. Some of the kids liked the aquarium idea and others changed them into viewing rooms for other animals.  We had wildlife sanctuaries, zoos and aquariums.