Keltiske knudedesigns blev populære i [[tatovering]]er i USA i 1970'erne og 1980'erne.<ref>{{Cite web|url=https://www.npr.org/sections/parallels/2014/11/25/366584255/the-american-origins-of-the-not-so-traditional-celtic-knot-tattoo|title=The American Origins Of The Not-So-Traditional Celtic Knot Tattoo|last=Shapiro|first=Ari|author-link=Ari Shapiro|date=25. november 2014|website=[[National Public Radio|NPR]]|archive-url=https://web.archive.org/web/20190123223441/https://www.npr.org/sections/parallels/2014/11/25/366584255/the-american-origins-of-the-not-so-traditional-celtic-knot-tattoo|archive-date=23. januar 2019|url-status=live}}</ref>
Psykologi Historie