“STAN DOUGLAS. PAST IMPERFECT: Works 1986–2007” is the most comprehensive exhibition of the Canadian artist’s output to date. Not unexpectedly, this undertaking—the result of a collaborative effort by two prominent art institutions in Stuttgart, Germany, the city’s Staatsgalerie and the Württembergischer Kunstverein—fosters an intense awareness of the extent to which viewers are able to cope with complexity. Much of Douglas’s recent work, from Suspiria, 2002/2003, in which the Brothers Grimm meet Marx’s Kapital as well as the 1977 Dario Argento classic from which Douglas takes his title, to