“The Writing’s on the Wall” filled with optical illusions, OK Go are back with yet another meticulously choreographed dance video for “I Won’t Let You Down.” Filmed in Japan, this new clip features more than a few umbrellas, Honda UNI-CUB personal vehicles (a kind of tiny robo scooter), and a cast of hundreds. Make sure to stick around for the final shot, hard to believe it’s even real, but knowing OK Go, it certainly is.