Here’s an interesting game of rings made by 2 college students.
“The Rhythm Ring interactive rhythm sequencer is an engaging musical device that enables the user to create a plethora of rhythms and beat patterns with the touch of their own fingers.
Besides being fun to play with, the Rhythm Ring provides a tangible method of arranging a musical rhythm. In our design, the user can arrange beats and modify them in real time by moving steel ball bearings between holes—a physical representation of notes on a musical staff. The Rhythm Ring continuously loops up to three tracks, each with its own voice. A central ring of LEDs provide the user with live feedback for current “playhead” position, and bright LEDs pulse when a note is played due to a detected bearing. The three tracks allow the playback of three different percussion sounds: snare, hi-hat, and bass drum.”