A small pebble is placed in the stream. The pebble is carried away. A large pebble is placed in the stream. The water flows around it.
Sēma is an ancient word for 'sign'. The poetic form Sēma points to signs of change in nature. Using intuition and imagination, a Sēma's meaning can have a human context. To know nature is to know humanity, for they are one and the same thing.