Calling all Artists, Hackers, Musicians! GUNNAR Optiks will be at SXSW 2013 as part of the Artist’s Hack on 03/10/13. Spotify is teaming up with the Backplane, and involving GUNNAR Optiks, NASDAQ, Qualcomm, and EA among others to support this collaborative hackathon – one that is dedicated to building the future of music, art, and video. If you’re interested in…