5th grade had a lesson in one point perspective and used the skills to make a room with a curved roof and checkered floor. They didn't know what the room was going to be while drawing it. When they finished I told them to paint the walls and roof with blue water color paint. That was when they figured out that it was going to be an aquarium. I played a video of live footage of an aquarium for inspiration so they could add ocean life to their own.