Work Wheat and Rope (1969) a land art project by Milenko Matanović, was created during their second phase, approximately at a time when they were showing Arte Povera installations in Zagreb's Gallery of Contemporary Art and started summer outdoor projects. They explored the countryside in search of new experiences that fostered friendship and unity between themselves and 'confrontations of their mental state with nature.
OHO is combined from the Slovenian words oko (eye) and uho (ear). It can be an expression of astonishment but also refers to a direct and immediate understanding of things based on their material presence. OHO was formed in 1966, and consisted of Marko Pogačnik, Milenko Matanović, David Nez, Tomaž Šalamun and Andraž Šalamun as permanent, core members, and a large number of changing participants.
OHO's work combined many sources and influences, from experimental literature to philosophy, happening and intermedia. Their work is usually divided into three phases, following an influential early essay by Tomaž Brejc, with phase one, from 1966-1968, dedicated to reism. The term, based on Latin res - thing, denoted a non-anthropocentric (anti-humanistic) world of things which existed in their own right and not through a subject-object relation. Between 1969 and 1970 OHO experimented with Arte Povera, land art, body art and conceptual art. At the time an umbrella term for those practices was the 'new art practice'.