At first glance, Kazuyoshi Usui’s “Showa88” might appear like a straightforward, if fanciful, portrait of Japan: you’ve got beautiful flowers, yakuza, geisha and plenty of bright colors. Look a little closer, though, and you might find that the colors are a little bit too bright, almost saccharine-sweet. “Showa88” is all about playing with the real and the fake, to create an imagined world in which Usui mixes together elements of Japan’s past, present and future.