From the Author:
“Just A Reflektor” is an interactive film directed by Vincent Morisset and featuring a new song from Arcade Fire. The film lets you cast a virtual projection on your computer screen by holding up your mobile device in front of your computer’s webcam. That way, you control all of the visual effects in the experience—not by moving a mouse on a screen, but by moving your phone or tablet through the physical space around you.”
You will need the Googles Chrome Browser to experience the interactivity.