Zener (ESP) Cards

The Zener (pronounced Zee-ner) cards, consisting of five shapes (circle, cross, wavy lines, square and star) were developed by Dr. J.B. Rhine at Duke University in collaboration with Karl Zener in the 1920s.  The cards were used in tests for extrasensory perception at Duke’s department of parapsychological research.  These cards have had four different back designs since the 1920s, and all four designs are shown below.  (From the private collection of Edward James Dean.)