The elements in this sound texture were created from audio processing of the composer's own voice speaking the phrase "Spring Rain."

The Haiku reference is metaphorical. The sound texture expresses a simple statement of mood, brief and complete in itself.

The Japanese Poet Basho (1644 - 1694)
https://en.wikipedia.org/wiki/Matsuo_Basho

Poem: 
Spring Rain,
Under Trees,
A Crystal Stream