I met with some of the Taxi 2 people when consulting to Traction Platform a few years ago, seemed like a great bunch of people.
Playtime begins once a shopper steps on a puddle. Each colorful image, representing a droplet of soda, makes a different sound. Young and old shoppers alike interacted with puddles that made ouch or bouncing sounds.
What a great concept and innovative use of 'existing technologies'