No tracks: Austrian, Klemens Torggler’s pivoting door systems are based on rotating squares. See Blogroll for a link to his site. February 19, 2014 · by Decanter · in innovation, product. · Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Like Loading... Related