File:GaltonNumberForm.png

Summary
A number form from one of Francis Galton's subjects. Note the convolutions, and how the first 12 digits correspond to a clock face. This motif is also found in more recent studies (Piazza et al., 2006) consistent with an evironmental influence on the exact pattern of numerical-spatial associations.

Author: Francis Galton Source: Galton, F. 1881 Figure plate B

Full ref: Galton, F. (1881) Visualised numerals. Journal of the Anthropological Institute, 10 85-102.

Full article available here: Galton, 1881