I’m always interested in discovering new ways of manipulating sound, not to mention examples of the ways music and math converge, and this is one of the coolest I’ve seen in a long time: Whitney Music Box.
The spinning dots move at speeds governed by various predefined ratios, resulting in cool swirling patterns that converge in different ways over time. Each dot is also assigned to a tone, and when the dot crosses the horizontal line, its tone is produced.
There’s even a variation where you can control the motion with a hand crank. Very cool!
(This is what we call “good Flash.”)