A poetic picture book about a lake’s longing for the sea.

A sad lake misses the sea and desperately wants to let it know. One day, a bottle falls into its waters and offers to carry a message to the sea. It travels down a river, meeting a fish, a cow, and finally a rock, which smashes it to bits.
The words of the poem it was carrying scatter into the sea, and the waves are so beautiful that they polish the broken bits of glass and turn them into treasure. The poem is so moving that anyone who looks at the sea nows feel a mix of nostalgia and desire.