You have to love a photographer that manages to capture all the beautiful depravity that goes down in the underbelly of a big city. Pretty much regardless of the era or the location, it’s out there, as long you’re looking hard enough. Granted, my knowledge of Tokyo in the ’70s is limited, but from what I can tell, folks were getting down in the park. Frequenting Tokyo’s Shinjuku, Yoyogi and Aoyama parks, photographer Kohei Yoshiyuki documented some of the city’s more adventurous citizens in action, as well as a handful of their secret–and, apparently, sometimes not-so-secret– spectators. Armed with 35mm film, an infrared lens and a camera with a flash, Yoshiyuki managed to capture a snapshot of a fascinating sexual subculture, in all its desperate, voyeuristic glory. The Park has been shown at galleries worldwide, and was re-published as a book in 2007. Try to find a copy here, or enjoy the gallery below.