The people at TBWA/Vancouver have created a unique interactive billboard.
It’s a special low-to-the-street billboard for Black Tower Home Security, a burglar alarm company. The board had lots of appealing tschotkes stuck to it, things like pillows, slippers, mirrors. (Sounds like stuff Alice in Wonderland would collect.)
Sure enough, people did collect the stuff right off the billboard revealing the underlying hidden message: “people steal.”
Pretty creepy and very effective. But wouldn’t seeing the hidden message on the board make you at least try to put back those slippers?