You know I was thinking that with all the oohing and ahhing and freaking out over eyeball tattoos, we sometimes forget another modification which is almost equally rare and unusual, and far less likely to blind you — flesh staples. First invented by Samppa Von Cyborg in the late 1990s as an improvement on pocketing technologies, the technology is now mature and mass-produced flat-bar staples are available from Samppa (voncyb.org). This particular example was done by the folks at Calm Body Modification (calmbodymod.com) in Stockholm. In addition to the sideburn staple, I also very much like the unique microdermal placement.
Edit/update — I wanted to add a longer shot to put it into context.