INDIO, California — More than a thousand glowing balls drop from the top of the stage as Arcade Fire plays "Wake Up" at the Coachella Valley Music and Arts Festival. The balls contained battery-powered circuit boards studded with full-color LEDs that changed colors in unison, thanks to built-in IR receivers and microphones. The effect was striking with the balls (mostly) changing color in unison. Unfortunately, after a few bounces, most people held onto the balls to keep them as souvenirs.
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