The trees of the forest shine brightly. The light of each tree is autonomous, slowly blinking.

When people pass close to the trees, the light changes color and a tone specific to that color resonates out. The light of the tree is transmitted to the surrounding trees one by one, continuously emitting the same tone.

If light approaches from within the forest, it signifies the presence of people there, making people more aware of the existence of others in the same space.