It's clever for an open air mall, I'll give them that. But when this case study tells me they "created a completed new choice - a product that only an open air mall could offer..." they're half-fibbing with the "created". They rented a machine/bought a service.
Remember Stuart Semple the artists who covered London in "Happy Clouds", remember the flogo cloud machine? Yes, that's what they used.
Oh, and they had a facebook tool linked with twitter aiming for that elusive social-media-trifecta. If they instantly instagrammed all the clouds they could've won. Or does that not count now that Facebook owns instagram?