Light up Seesaws

Luminothérapie is an annual event at the Quartier des Spectacles in Montreal. It is a celebration of light at night. The firms Lateral Office, CS Design, and the EGP Group offer this contribution called Impulsion. 30 giant seesaws with lights and speakers activate when one person sits on each end. Totter back and forth to emit mesmerising displays of light and sound. They're on display until January 31, 2016.
You can see a video of these wondrous seesaws in action here.