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Step 1
Inflate a beach ball and use a felt pen to draw a circle around the top, with the air valve in the center. This will be the opening of your concrete block.

Step 2
Apply water-based concrete-releasing agents to the entire surface of the ball.

Step 3
Wrap strips of hardware cloth around the surface of the ball, leaving the area inside the drawn circle clear. Be sure the strips remain as evenly spaced as possible: Multiple layers on top of one another will create an uneven surface, which makes it trickier to get the concrete sphere right.

Step 4
Place a layer of wet concrete around the surface of the ball. The layer should be a uniform 1/2 inch thick around the entire surface. The area inside the drawn circle should be kept completely free of concrete mix.

Step 5
Allow the concrete to harden for at least 24 hours.

Step 6
Deflate the ball and carefully remove it from the concrete.

Step 7
Add additional layers of concrete over the first until the block is of the desired thickness. You may wish to do this in stages, adding a little concrete at a time instead of placing it all on at once.

“ I chose this project because we worked on it under the heat of the sun and for the reason that I have already experienced on how to make hollow blocks. I know also that I can use it in the near future”