How to Make Translucent Concrete

Cut fiber optic threads to the width of the brick mold, approximately 4 inches. In the United States, the standard brick size is 8 by 4 by 2 inches.

Pour a little vegetable oil into a brick mold. Wipe with a rag so only a thin film of oil covers the inside of the mold.

Pour 2 cups of concrete mix into a bucket. Add water to the mix and stir until the mix is the consistency of pancake batter.

Spread one half cup of the mixture in the bottom of the mold.

Spread fiber optic threads in a thin layer across the width of the brick. The fibers must touch each side of the mold in order for light to reach through the finished brick.

Add another half cup of concrete mixture, gently spreading it over the fibers. Continue layering the optic fibers and concrete mixture, making sure the threads extend across the width of the mold and ending with a layer of concrete.

Tap the mold to settle the concrete and break up any interior bubbles. Cover with plastic wrap and allow to dry for 24 hours.

Turn the mold upside down and tap to remove the brick. Allow the brick to finish air drying.

Turn off the lights and hold a flashlight up to the brick. The light is transmitted through the brick by the fiber optic threads embedded within the concrete.