Japanese artist Tokujin Yoshioka does not sculpt his work, but grows it. His Venus chair was created by immersing a plastic mesh substrate into a tank filled with a chemical solution. Gradually crystals precipitate onto the substrate and give structure to the chair. It might not be the most comfortable place to take a seat, but it's a great example of guided growth. Yoshioka has experimented with various other crystalline structures ranging from Greek sculptures to entire rooms. Maybe a scale replica of the Fortress of Solitude isn't too far off.
Images via Today and Tomorrow, Core 77 and Siong Chin.