Paint with light. Source: https://glitch.com/edit/#!/dear-stranger
It's perlin noise with SVG. It is a great reminder that there is a lot of really cool graphics stuff that can be done with it. A robust medium that nobody really knows about.
Bezier play is a web-based instrument and visualizer you play with your keyboard, or MIDI device. The visuals are created using SVGs and animated using CSS animations. Find the project at https://bezier-play.glitch.me/ !