I just found an old art magazine that includes an article about Joel Stein, a French Op-Artist who experimented with laser light sculptures in the late '60s. The article is in "Realities", #234, May 1970, page 78. He was a contemporary of Carl Fredrick Reutersward, Rockne Krebs, Keiji Usami, and Lloyd Cross in using laser beams as sculptural elements around the same time as Leo Beiser, Lowell Cross and Elsa Garmire were experimenting with laser scanning.

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