Interactive ads are "three dimensional" in the sense they require the same artistic and sales skills as conventional banners, but they also require the skill to create an interface. That might seem simple, but most people don't seem to have the ability to step back and look at something from the perspective of a user.
The buttons on this board that have impressed me are those that have even limited interactivity. Designers on this board who are thinking to the future might want to start putting their own interactive buttons in their sigs now.

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