Coqui Spirits is an ambient soundscape meant to evoke the little tree frogs that live in Puerto Rico.  They are called coqui, and their song sounds a lot like their name.

As far as method or technique, the piece was created by playing two repeating sequences of sine wave notes together. One sequence was four measures; the other was seven, so the overlap created a variety of patterns.  The result was processed through a chorus, using extreme settings that were varied during the performance.