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The explanation and description of these blocks is found in the upper, right hand corner. The plaque explains the use of these concrete blocks and metal spheres during WWII. I hope the script is large enough to read:):)Taken at Paradise Beach Park in Tiburon,Ca.Thanks for your comments friends:):)
So I searched on the net, but couldn't find the text of the plaque either.
My search has brought me to this site and this photograph however. The information/pictures are very interesting and supports/explains to a certain extent what we're seeing on your capture. Thanks for making us aware what has happened in that time, Buddy!