The sense of water coolness is shown in the pebble area provided in each open space. When the rain is down, these open spaces detain water and allow it to runs into the ground. The excess moisture that is left in the pebble ground both from the rain water and underground water is a necessary factor needed for a growth of moss.
People can sense the exsistence of water not only by their eyes, but also by their touches. Moreover,the beginning of life as the presence of vegetation, and human touch emphasize the coolness of water.