Walking into “Eternal Return & the Obsidian Heart,” Brooklyn-based artist Raúl de Nieves’s survey exhibition here, felt like entering a carnival-like space that was part Gothic cathedral, part queer dance club. The artist, like an alchemist, transforms the mundane into the marvelous. For instance, Celestial, 2007, an early sculpture, began as a pair of high heels de Nieves wore to sundry queer and art events while living in San Diego. But after some labor-intensive glamorizing, the shoes were now barely recognizable. In encrusting them with sparkling colorful beads and pearls, the artist had