Oron Catts and Ionat Zurr of the Tissue Culture & Art Project have "grown" a quarter-scale replica of Stelarc's ear using human cells. The ear is cultured in a rotating micro-gravity bioreactor which allows the cells to grow in three dimensions. The ear is fed with nutrients every 3-4 days in a sterile hood.

http://www.tca.uwa.edu.au/extra/extra_ear.html