A dragonfly shaped pin, like the one from Neal Stephenson's The Diamond Age. Unlike The Diamond Age, it communicates with its peers using IR to synchronize the light show.
This repo contains the FW. The devices uses a Cypress PSoC as its heart. It can programmed using the (free!)(Windows only :( ) IDE at http://www.cypress.com/products/psoc-creator-integrated-design-environment-ide.
HW files avalible at https://upverter.com/borgel/748d5ee8f0eb00f8/sympetrum-v02/ for now. Baked gerbers coming eventually.