Make the fish out of cardboard or felt, and thread it to the button. For the aquarium, you just need a box. Remove all 8 flaps, then cut windows in the sides and slots for the fish in the top with a box cutter or exacto knife.
7 of the Best DIY Cardboard Play Structures and Tutorials
Today we decided to present you some creative and interesting DIY cardboard playhouse ideas. With some really basic and inexpensive materials, a plain cardboard box can be transformed into a stimulating and colorful play house.