Shishi odoshi or deer scare is a gereric device made to scare away animals such as deer from damaging gardens and even a farm. Sozu is a special water fountain used specifically in Japanese gardens. Sozu consists of a bamboo tube pivoted to its balance point - its heavier end is down and resting against a rock while water fills into the other end of the bamboo tube. After the water has accumulated this moves the tube's center of gravity past the pivot, causing the tube to rotate and release water. The heavier end falls back against the rock making a sharp sound, and the cycle repeats. This noise is intended to startle deer which may be grazing on plants in the garden.