Table of the Elements in an Irregular Spiral. 1940s.
"Rainbow-colored periodic table of the elements designed in the style of an irregular spiral. Per text accompanying the table, the colors and construction of the table are designed to express the relationship among elements in terms of the repetition of certain chemical properties, with elements whose chemistry is almost identical grouped together in blocks or connected by solid arrows. Additionally, all related elements are represented with different shades of the same color."
Science History Institute
