I love the mystery behind this banner. No brand, no sales pitch just an invitation to explore.
The user is then taken to https://www.070829.com/ and still not told what's being advertised. It's a powerful piece that attracts the eye and lures you in. This is one I'd love to see the CTR on.
P.S sorry for spoiling the surprise that this was a Nokia ad.
More info on this promotion, and others like it, in the news here.