This piece, for 2 glockenspiels, was written for Duo Vertigo, which is the wonderful percussionists Claire Edwardes and Niels Meliefste.
Two Glockenspiele play similar lines in different tempi and cause the material to echo back and forth between the two of them. Each section uses a different selection of materials, interlocking them in generally simple, repetitive ways and causing diverse interferences (harmonic and contrapuntal relations) between the two voices. The result is a dense web of illusory voice leadings, types of motion and harmonic shadings. The sequences are interrupted by pauses and crumbs of solo writing.