The term ‘happening’ was invented by Allan Kaprow. Happenings have been defined in different ways. Kaprow’s definition of happenings being radical prototypes of performance art fits the bill for most forms of happenings. Radical because a happening cannot be perceived from one perspective. As a consequence, only fragments can be documented, which implies that this art form does not comply with the mechanisms of the art market. At least in theory. The items for sale in this category are mostly related to happenings from the Sixties, especially those in The Netherlands and Belgium, that were the predecessors of or related to the Sixties underground and Provo movements. In The Netherlands, Fluxus happenings, Open het Graf (Open the Grave), Living Painting, Stoned in the Streets and the happenings performed by Robert Jasper Grootveld are examples. In Belgium, the group around Panamarenko, Hugo Heyrman and Wout Vercammen in collaboration with Yoshio Nakajima (member of the Unbeat Art Association, Japan) that published the magazine Happening News, performed happenings in Antwerp that shared some elements with the Dutch happenings.