One of my favorite artists, POSE MSK, did a Ted talk. It just came up on my youtube feed as I started uploading today's TSOP vlog. Oh, that's right, TSOP IS BACK!!!
Check out some of Pose's art.
The bottom one is a 14 color screen print. I hope that some day I can get a POSE screen print.
Check out his Ted Talk below about Graffiti as an educational tool.