The cypresses connecting the Nagai Botanical Garden entrance to the Oike Lake shine brightly.

When people pass by the cypresses, they shine more brightly and produce a tone. The light of that tree then radiates out, spreading to nearby cypresses as they resonate with the same tone. If a wave of light comes from the other side, it signifies the presence of people there. People gain a heightened sense of awareness of the existence of other people in the same space.