September 1970, 8½x11, pen and pencil-lead powder in 3-in-one oil on paper
I sent a copy to Paulo Soleri, the Arcosanti architect, as a figure in my Tetrahedron Report, the original was (is) to fragile to send in the mail; the report was the beginning of my obsession with tetrahedra
I was taking mineralogy at the time and discovered tetrahedra are the form of the earth (SiO4); I learned later that they are the form of all life as well (Methane, CH4)
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36 x 36 inch square