The Restless Spheres for solo cello is named after an excerpt from Christopher Marlowe’s Timburlaine: “Still climbing after knowledge infinite, And always moving as the restless spheres.” It is a continuous movement set in two main parts with a brief introduction and interlude. The music oscillates between tempered and micro-tonal tuning throughout, and offers a reflection on Marlowe’s idea of ever searching for something more, out of reach, or perhaps unattainable. A certain restlessness can also be heard in the manipulation of the tuning of two of the cello’s strings. At first the highest string is tuned lower than usual, and is retuned upwards during the introduction, while in the final section the lowest string is gradually tuned lower and lower, resulting in a much deeper bass than typically heard on the cello.