The trees shine brightly. The light of each tree is autonomous, blinking as if breathing slowly.

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 the trees in the distance, it signifies the presence of people there, making people more aware of the existence of others in the same space.