With a history of being a fortress until World War II, Sarushima Island is now a special place with magnificent nature. Our work is a real-time sensing of a large tree standing on the ruins of a naturally eroded turret, allowing visitors to experience the vibrations and sounds hidden within the tree in the dark.The sounds and vibrations are dynamic and proof that the tree is alive right now.The experience will stir people's imagination. Hence people may feel as if 'the Tree says something'. It is a kind of dialogue between man and tree, creating a new point of contact with nature.