Spiegelsaal (Hall of Mirrors) is the gigposter love child of skrash.com. (Fritte) and Mitchum D. A. (Torsten).
Thanks to the wonders of the interwebz, these 2 friendly gigposter old hands nurture their offspring without ever being in the same city, rather indulging in epic E-mail-ping-pong-battles between Düsseldorf and Hamburg instead, one poster at a time.