human
See, Helen explained,
gpt
Will that solve the puzzle?
human
Why, I really believe it will! exclaimed Joe, after a moment's thought.
gpt
Yes, I could have metal clips, made water-tight with rubber, fitted inside the tank. Taking five inches off each side wouldn't mean much loss. Then I could slip four sheets of glass down in the metal clips, and, as you say, fill the intervening space with water for the goldfish.
human
Exactly, cried Helen.
gpt
The audience can't tell whether the fish are in the tank with you or not, for the water and glass, being transparent, will make it look exactly as if you and the fish and the seal were in the same bit of water.
human
Good! cried Joe.
gpt
I'll do it! The very thing, Helen!