Whilst his work continued to be included in a number of major group shows, by 1989 he would refer to himself as 'retired from fluxus'. Becoming increasingly reclusive, he only allowed two retrospectives of his work in the last 30 years of his life; both were called 'A Heterospective' (loosely translated as a 'Collection of Othernesses'). The second, a large museum exhibition that was shown in Cologne and Barcelona, 2005–06, opened with a simple sign marked 'End' and ended with another stating 'Start'.