Found by Steam Forums user Niamor on the portfolio of Valve artist and sculptor Matt Charlesworth. http://web.archive.org/web/20170603120032/http://forums.steampowered.com/forums/showthread.php?t=2755826&page=554 http://web.archive.org/web/20150217050513/http://www.mattcg.com/wordpress/wp-content/uploads/2011/10/oldMan.jpg