Wegmüller was born in Bern, the son of Romani travellers, and grew up in homes and farms with
foster parents. He traveled around Europe and India, making paintings and jewelry. He settled in Basel in 1957 and became an expert on the tarot.
Working as a visual artist, Wegmüller designed a set of 22 tarot cards. His friend Timothy Leary introduced him to Rolf-Ulrich Kaiser of Ohr Records in Germany, and it was agreed that Wegmüller record an album on the theme of tarot, with musicians Klaus Schulze, two members of Ash Ra Tempel, Manuel Göttsching and Hartmut Enke, and other musicians collectively known as The Cosmic Jokers.
The album was recorded in 1972 and released in 1973, with an elaborate package that included a set of Wegmüller's cards. Wegmüller recites stories about each of the tarot cards on the album, which also contains lengthy instrumental passages.