Women and work / Gertrude Williams. London: Nicholson & Watson, 1945
“Arntz was aware of the New Typography (his work was featured in Jan Tschichold's book on the subject), and he later claimed to have followed its principles in combining pictures with text. Indeed, from this point onwards, Isotype charts generally exhibit a relaxed asymetrical layout, with type ranged left, as the statistical pictograms often were.
Arntz's great skill in pictogram design was his ability to produce modular picture units that could be repeated in sequence along a line -like characters of a picture script- without making them excessively rationalized or geometric. For example, his pictogram for different kinds of people are recognizable human silhouettes. The apparent simplicity of the images belies the great subtlety of his drawings.”
Petra Eisele, Annette Ludwig, Isabel Naegele, eds. Futura: the typeface. London: Laurence King, 2017 (p. 256)