Remember those liquid toys that were filled with moving bits like glitter or snowflakes? Well, Vancouver’s Playland took that idea and flattened it for transit. Loading up a 3D bus ad with liquid and images of organs, the pieces inside were weighted differently so that they could move easily. The cartoon organs would then shift and sway from side to side as the bus drove, stopped and swerved – much like a body’s organ might on a roller coaster at the theme park.