- George Lichtenberg, Color triangle, ca. 1775. Lichtenberg's replication of Tobias Mayer's triangle has only seven chambers per side, rather than Mayer's suggested 12. In his comments to the Opera inedita, Lichtenberg complained of the difficulties of creating a color reproduction according to Mayer's instructions. Source: From Tobias Mayer, Tobiae Mayeri. . . Opera inedita: Vol. I. Commentationes Societati Regiae scientiarvm oblatas, qvae integrae svpersvnt, cvm tabvla selenographica complecten. Trans. and ed. Georg Christoph Lichtenberg. Göttingen, 1775, plate III.
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