What is the purpose of the concrete projection into the midst of the tranquil pool?

The concrete projection reveals itself as a staircase leading into the depths of the pool. From this angle the water lilies seem to be extremely well ordered.

The curved wall ultimately reveals the Water Temple itself.

Passing through the door of the straight concrete wall one continues on the white gravel path around a curved wall which will gradually reveal one's purpose.

Tadao Ando, architect, 1990-91. This is the new main temple for the Shingon Buddhist sect. Over brilliant white gravel one enters Ando's trademark concrete wall emphasizing that one is enterring a special place.

The Water Temple is appropriately covered with water lilies.