The Bloch sphere is usually drawn for qubits, but the same geometry describes a classical vibrating nanostring whose two flexural modes can be coupled and steered by dielectric fields. What the analogy captures, and where it breaks.
The Bloch sphere is normally the geometry of quantum objects like atoms and superconducting qubits, but a Nature Physics team drove a purely classical vibrating nanostring around the same sphere using its two flexural modes coupled by dielectric gradient fields
The Long View