So what is it?
Well, it's a reflection in a window of a closed shop that had one of those pull down chain link gates behind the glass. The reflection is an illuminated building with a big red beating heart in front of it. The bottom of the heart is obscured by silhouettes of the people watching the show. People were able to touch a console that allowed the heart to match their heart's rhythm with light flashes as love songs played over loud speakers.
This was one of the installations at the Fête des Lumières. Click HERE to see a 30 second video of the installation.