Written for flutist Paula Frechette, Penumbra has a very interesting and challenging flute part, with a technique of "rasgueado" and "tambora" used in the guitar part which is a percussive effect that is achieved by rapidly strumming the strings with the right hand for the rasgueado effect, and intermittently striking the strings over the sound hole with a clenched fist in order to subdue all sound and create a percussive effect from the strings hitting the finger board. 

Cover Art by Kimberly Winder