The subconscious art of graffiti removal (excerpt) 03/25/2015By wtrhs Index & Index [youtube https://www.youtube.com/watch?v=pUa9x1-SMLo] 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.