Muni Diaries has the scoop on this beautiful homage to the 38L Geary and the topography it traverses and landmarks it passes on its route from Downtown through the Richmond. Graphic Designer Lucia F. Garcia lives in the Outer Richmond, so she has probably ridden this route many, many times (and as someone who once lived in the Inner Richmond, I agree that it's all about the 38L and not just the 38).
Too bad that one of the landmarks, the Alexandria Theatre, will be no more. According to Curbed SF, the abandoned movie theater, which has been closed for more than 10 years, will soon be razed and turned into condos, with possible plans for a small theater within that space.
See a larger version of the poster here.