Wohnungsobjekt II - (Living space object, 1974) A block of frozen black ink that has to be kept in the freezer.
I find this a delightful idea. It is so horrendously impractical and economically unsustainable that it forces you to re-think your normal use of living spaces, household appliances, artworks and the art market. Imagine having to sell this object. Imagine it melting during a power outage.
Dachskulpturen - (Rooftop sculptures, 1972) Photographs of air-raid sirens atop rooftops, accompanied by a 45-rpm vinyl recording of a test air-raid alarm.
Again a delightful idea, that is impossible to replicate nowadays. All these small local sirens have disappeared and have been replaced by big centralized sirens. I can imagine how the artist read them as installations, as sculptural interventions in public space.