Tea ceremonies, bullet trains arriving to the exact second, intricately dressed, immaculate geisha and the importance of keeping face: these common images of Japan conjure up the notion of a highly-controlled and conservative society. Graphic images of enormous penises and a woman being pleasured by an octopus are not, perhaps, what you might expect. And indeed for the last century and a half the explicit art of shunga, or ‘spring pictures’ has been taboo in Japan- yet this only came about once the country began to absorb Western cultural influences. Before the late-19th century, the Japanese did not share the dominant Western idea that fine art and pornography were very…