An Artist is a human entity that carries a worldview, the one its Portrait captures through a Motor and a Means. This entity consists of one or more people: a duo or a collective forms a single Artist, designated by the name under which it exhibits.
The worldview is carried by the permanent members. A collective counts as an Artist as long as its permanent members outnumber its passing members. Beyond that point, the name designates an organisation, which continues through statutes or a protocol, no longer an Artist: the entity ends on that date and its Portrait covers the earlier period. A permanent member is one present throughout the period of the solo exhibitions in institutions on which the collective's recognition rests, under the criteria of the International Scene or the French Scene. When a collective's membership is not documented, its Portrait says so.
An artistic approach is indivisible. For any given period, a member and their collective have only one Portrait: that of the more recognised signature, measured first by its solo exhibitions in institutions. Before or after the collective, the member's individual practice has its own Portrait; the two Portraits never cover the same period.