Gradual Edge - Cello and Organ

Many years ago I saw a sculpture of Anish Kapoor: in this sculpture there were two huge halved orbs hanging from two sides of the room. The halved orbs were dark purple blue, which was so dark that the end of the orbs (their inside) was not visible. They seemed, instead, like endless openings.
The piece Gradual Edge is an attempt to trace, as if through touch, and follow the imaginary passage on this half orb, attempting to figure out, through touch, the transition from substance to the endless cavities inside in increasing darkness. The piece is dedicated to Christina Meissner and Poul Skj lstrup Larsen. Chaya Czernowin