Hey, this is just a GIF, here's live demo: https://krzema12.github.io/EchoLedSimulator/
This simple web app lets you manipulate individual LEDs of a mocked Amazon Echo, and ultimately create animations in a declarative manner. You just specify how each of 12 LEDs should look like in a particular moment, and the rest is done by the framework.
If you want to add your own animation, see Animation Registry definition.
Protip: for best performance, use Google Chrome.