Fred Wilson’s exhibitions “Wildfire Test Pit” and “Black to the Powers of Ten,” which have taken over two galleries of the Allen Memorial Art Museum, a venerated teaching collection at Oberlin College, are sagacious follow-ups to the artist’s recent installation at the Cleveland Museum of Art. In the CMA’s Glass Box Gallery, an architecturally scaled glass vitrine inserted into the museum’s original Beaux Arts edifice, Wilson presented a spare installation of merely four works. Conversely, these exhibitions represent his largest combined project to date: an abundant gathering of the artist’s