What stuck with you from Joachim Koester’s exhibition “Of Spirits and Empty Spaces” was primarily the powerful memory of its atmosphere, of a progression through darkness, from one black-and-white projection to another, with passages through light and color for his photographic works. Above all, you were left with the impression of having plunged into a remarkably coherent yet varied universe without any trace of monotony. The twenty-one pieces in the show date from 2003 to 2011, some having been produced for the occasion. All reflect the artist’s method of combining documentary and fiction and