The correspondence between the directional pathways of wrapping and the orientation of stepped frets in a tunic band pattern. (a) Z-Up; (b) S-Up; (c) S-Down; (d) Z-Down.
Isbell, William H.; Uribe, Mauricio I.; Tiballi, Anne; Edward P. Zegarra, 2018, "Visual database", https://doi.org/10.25346/S6/1B33FN.