The idea was brought to life as a “viral” (ahem) marketing campaign by a French group, Enfants Terribles. The real name of the person is identifiable only under a microscope.
While these are obviously impractical to a degree, the coolness factor almost outweighs it for me. If I got one of these at a conference, I’d definitely remember the booth better (take note vendors!).
Slightly relevant side note, I love creative business card designs.