The paper Galton—Visualised Numerals (1880) (there’s several documents with this title floating around, this is the full paper and has the most pictures) contains a bunch of drawings of people’s professed visualizations of the number line. Some are quite curled indeed!
The paper Galton—Visualised Numerals (1880) (there’s several documents with this title floating around, this is the full paper and has the most pictures) contains a bunch of drawings of people’s professed visualizations of the number line. Some are quite curled indeed!