The GIANT sticker campaign can be explained as an experiment in Phenomenology.
Heidegger describes Phenomenology as "the process of letting things manifest themselves".

Phenomenology attempts to enable people to see clearly something that is right before their eno but obscured; things that are so taken for granted that they are muted by abstract observation.
The FIRST AIM OF PHENOMENOLOGY is to reawaken a sense of wonder about one's environment.

(click the "read me" icon to open the manifesto written by Shepard Fairey)