In this Spark video produced by KQED, see how natural found objects are juxtaposed with pieces of technology in Joe Mangrum's design sculptures. Since the mid-1990s, Joe Mangrum has been making temporary installations from found objects. Often exhibiting his designs in public spaces, Mangrum hopes to catch his viewers off guard, inserting something unexpected into their everyday routines. Spark visits Mangrum as he works on a large-scale piece for Red Ink Studios on San Francisco's bustling Market Street.