“Rosemarie Trockel: A Cosmos” is a very unusual and thoroughly engaging survey spanning some 40 years. Not only does it impress by demonstrating the range and scope of the German artist’s own endeavors, but also by including work by artists who have influenced and inspired her over the years. Working in a wide variety of mediums, from film and installation to textiles and ceramics, Trockel is nothing if not obsessive, which explains her connection to outsiders like James Castle and Judith Scott, with whom she generously shares part of the exhibition space.