The subconscious art of graffiti removal (excerpt) 03/25/2015By wtrhs Index & Index Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Post navigation Dubbelvorm nr. 4, 1958 by Carel VisserInterference (wave propagation) – Wikipedia, the free encyclopedia Leave a Comment Cancel replyYou must be logged in to post a comment.