“OH BOY … the front sign is going up on the gallery,” an excited Ruby Mazur posted on his Instagram account on Aug. 7, accompanying a video of his son hanging a carved wooden sign reading “The Ruby Mazur Gallery.” The sign is instantly recognizable because even if you don’t know Mazur, you probably know his work. In between the words Ruby and Mazur is the world-famous “Mouth and Tongue” design from the Rolling Stones’s Hot Lips record, seen on T-shirts everywhere. That logo is the most famous thing the 77-year-old has made in his long career in rock and roll art, but by no means the only famous thing.