Amidst the towering new structures of cosmopolitan Tokyo are pocket gardens conducive to relaxation, silent thought and contemplations of nature.

Think Tokyo and images of a megalopolis materialize: cloud-scrapping buildings sprouting overnight like bamboo shoots; the soba-noodle tangle of roads, rails and subway tunnels; the crush of people packed together like potato wafers in commuter cans. Tokyo: the frenetic capital of Japan, where people live as many as 22,000 to the square kilometer.