In the suggested performance notes you can see the large amount of space only between the piano and the brass choir, but also between the brass members. Sonically, this places a lot of emphasis on harmonic distances within the score, which gives the piece an ethereal, dark timbre between the often busy piano lines and brass flourishes. Furthermore, variations in physical space also contribute to a unique performance experience for both audience members and musician. This is a technique that is also used and seen in other works by Xenakis, including Terretektorh and Nomos gamma, where he places audience members among the orchestral players