The motor turns at a constant frequency.
The drum surface is where sound manifests.

Between them is a medium.

This intermediary—material, pressure, contact—translates continuous motion into vibration. In this space, frequency becomes sound.

The materials function as metaphors for attention.

Some forms of attention are direct and steady. Others are faint, intermittent, or unstable. In certain configurations, an unwavering rotation is perceived as irregular or chaotic.

The system remains constant. What changes is how it is brought into reality.