In 1976, after moving to Amsterdam, Abramović met the West German performance artist Uwe Laysiepen, who went by the single name Ulay. When Abramović and Ulay began their collaboration, the main concepts they explored were the ego and artistic identity. This was the beginning of a decade of influential collaborative work. Each performer was interested in the traditions of their cultural heritages and the individual’s desire for ritual. Consequently, they decided to form a collective being called “the other”, and spoke of themselves as parts of a “two-headed body”.