Graphic representation of the periodic table of chemical elements designed as a series table consisting of two parts that are arranged like mirror-images of one another. While the design of this table is unattributed, it bears some similarity to Type IIC2-6 as classified by chemist Edward G. Mazurs in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957) and was likely sketched by Mazurs during the preparation of that volume. Notably, although the illustration is labelled "Figure 23," the volume to which that figure number corresponds is unknown.