In the Japanese rock garden , rocks sometimes symbolize mountains ( particularly Horai , the legendary home of the Eight Immortals in Buddhist mythology ) ; .
Rocks can be rocks or a living creature ( usually a turtle , or a carp ) .
In the Japanese rock garden , rocks sometimes symbolize mountains ( particularly Horai , the legendary home of the Eight Immortals in Buddhist mythology ) ; or they can be boats or a living creature ( usually a turtle , or a carp ) .