While studying information science and engineering as a graduate student at the University of Tokyo in 2008, Takatsugu Kuriyama created a 3-D map of underground railway lines in Tokyo that included the subway systems and JR Lines. He used water hoses and multicolored ink to replicate the maze of lines that weave through the earth under the nation's capital.

The result, which he calls Tokyo Arteria, is as impressive for its beauty as it is for demonstrating the complex world that lies beneath Tokyo. Buried under the capital is a system that is "vivid, beautiful and even mysterious," Kuriyama says.

The Japan Times On Sunday spoke with Kuriyama regarding his unique project.