A material language

AT this time of year, collectors of tribal (or, as some prefer, primal) arts would customarily be checking budgets and making travel arrangements to visit Paris and London, where Parcours des Mondes and Tribal Art London usually run back to back. The Parisian event is going ahead physically in the little streets of Saint-Germaindes-Prés, between September 7 and 12, with 42 dealers, even if not all the regular exhibitors from overseas are able to participate, but, in London,