Parents are known to have their child’s baby shoes bronzed as a familial keepsake, and Los Angeles-based artist and designer Matthew Senna is applying that time-worn concept on a much wider scale, transforming a duo of Air Jordan models into gleaming cultural artifacts. The two silhouettes in question are the Air Jordan 3 and Air Jordan 13 — dubbed Study 003 and Study 013, respectively — with the former billed as a “design that changed the future of a culture,” while the latter “captures the end of an era.” They’re up for sale through Senna’s  site, with each carrying a $2,250 price tag.