Underwater Porthole

Use circles and triangles to make a porthole looking through an underwater scene.
Underwater Porthole craft


  • White construction paper
  • Craft foam
  • Poster paint
  • Plastic plate
  • Scissors
  • Glue stick
  • Sponge brush or kitchen sponge
  • Potato
  • Knife
  • Chopping board
  • Compass or any object to make a circle

Safety Tips

  • Watch out for this sign Ask for an adult's help.. It means adult help is needed for the particular step.


Step 1a Underwater Porthole 1. Draw and cut a big circle on construction paper, roughly about 1 foot in diameter.

Use a sponge brush to paint the circle blue. The sponge creates a great underwater effect.
Step 1b Underwater Porthole   If you don't have a sponge brush, you can use a kitchen sponge or bath sponge.
Step 2 Underwater Porthole Ask for an adult's help.2. Slice potato into wedge-shaped sticks.
Step 3 Underwater Porthole 3. To make colorful seaweed and corals, dip the base of a potato wedge on poster paint and stamp long chains of triangles starting from the bottom of the circle going upwards.
Step 4 Underwater Porthole 4. Make a porthole frame by drawing a circle on craft foam. The frame should be as big as, or slightly larger than your painted circle.
Step 5 Underwater Porthole 5. Draw a smaller circle inside the first one.
Step 6 Underwater Porthole 6. Cut out the circle including the inner circle so that you come up with a round frame.
Step 7 Underwater Porthole 7. Cut smaller craft foam circles and glue these around the frame.
Step 8 Underwater Porthole 8. Glue the circular frame on top of your painted circle.
Step 9 Underwater Porthole 9. To make the fishes, cut triangles from craft foam. For each fish, cut a big triangle for the body, 2 smaller triangles for the fins, and 1 triangle for the tail. Put the triangle parts together by gluing the fins and tail on the body.
Step 10 Underwater Porthole 10. Flip the fishes over so that the glued parts are at the back.
Step 11 Underwater Porthole 11. Glue the fishes onto your underwater scene.
Step 12 Underwater Porthole 12. Finger paint the fishes's eyes and mouth. You can make some bubbles too!
Step 13 Underwater Porthole 13. Continue finger painting designs on your fishes or you may try using the wooden tip of a paint brush to make the finer details.

When you're happy with your underwater scene, set the picture aside to dry.
Step 14 Underwater Porthole 14. Your porthole can give your room a nice underwater view!

More Ideas

Printable sea animals template Instead of making triangle fishes, you can draw your own fishes or print out and color these cute sea animal templates or decorate these fish shapes.