In 1958, on a visit to Iceland, Dieter Roth met the Swiss goldsmith Hans Langenbacher, and the two soon agreed to collaborate. Roth came up with the brilliant idea of devising rings with exchangeable parts--a variety of brightly-colored corkscrew-like attachments to the ring's main body--which Roth then housed in containers such as old pipes or wooden boxes. This gem of a volume reproduces Roth's rings alongside sketches, photos and a lengthy interview with Langenbacher; it is an intimate and inspiring addition to the Roth corpus.