Minus Delta t (−Δ t) were a performance group and music band founded in Zurich, Switzerland by Karel Dudesek, Chrislo Haas and Mike Hentz in 1978 and lasted until the late 1980s. All three members were autodidacts who had previously been active in the alternative art and music scene. Hentz and Dudesek formed the core of the group after Chrislo Haas left the group to make electronic music with the bands Deutsch Amerikanische Freundschaft and Liaisons Dangereuses.

The group was a significant part of Neue Deutsche Welle (NDW/New German Wave). They held their ground in the experimental field by refusing commercialization and played numerous groundbreaking concerts in Europe. Their core idea was the obsolescence of stage and audience and the unique composition technique of their music; composing an atmospheric score based on emotions during the performance.

Among the activities that made them known were performances in the early German punk and new wave scene, such as at the “Geräusche für die 80er”-festival in Hamburg’s Markthalle, of which a recording was also released on the Neue Welle label Zick Zack, and at the “Shvantz”-festival at Frankfurt’s Städel School.

However, their Bangkok project is the best known and most spectacular action of group. They transported a 5 tonne stone from Wales to Asia starting in 1982, through Germany, Austria, Yugoslavia, Turkey, Syria, Lebanon, Iran, Pakistan and India, and ended in 1984 at the “Bangkok Festival” in the Thai capital, which the group had helped conceive and organise. During the journey they met, among others, the Austrian Chancellor Bruno Kreisky, the Fluxus artist Ben Vautier, the Dalai Lama and the Pope, who blessed the stone in the Vatican.
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