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“Disc 9” graph Disc 9  (zoom in)
The first half-toned graph created using GrafEq. Prominently shown on the front of our colour brochure for version 2.01, this was made shortly after I realized that halftoning was possible. Close scrutiny will reveal that the half toning pattern used is more geometric than the mathematically simpler one used for the more recent Simply Spherical.
formula for “Disc 9” graph