The birds interaction with the set pieces can best be described as precarious cohabitation. The large geometric set pieces are animated by humans on stage as birds are introduced into the mix. Because the birds use sight and touch instinctually to assess danger in their environment, the set pieces act as a buffer as the birds and the human attempt to coexist live in front of the audience.
A specific example is a having the Harris hawk fly across the theater and land on a large monolithic hat on top of the marimba players head. This forces they musician to stop playing and hold still as the predator scours the theater, taking off to fly through a geometric set piece and back stage.
photos courtesy of Laila Archuleta