Rudolf Flesch, The Art of Clear Thinking, Harper & Row, 1951


While he was at it, he also asked people how they saw numbers, the days of the week, the months of the year and the alphabet. The answers he got make a weird collection. For instance, look at some of his "Examples of Number-Forms" on the next page--abstract drawings that seem to make neither rhyme nor reason. But that's what people said that had in their heads, and there is no question that lots of them did and do. (Galton says "the peculiarity in question is found in about one out of every thirty adult males or fifteen females.")