Fishtail Patterns

Fishtail patterns were used in printmaking in order to distinguish the middle section of the sheet. This allowed the book maker to properly fold the sheet along the center.

Source: Minah Song (2009) The history and characteristics of traditional
Korean books and bookbinding, Journal of the Institute of Conservation, 32:1, 53-78, DOI: 10.1080/19455220802630743

Fishtail Patterns