Over the last few years the Channel 4 idents have become a ubiquitous presence for UK viewers, making it easy to take for granted their visual significance.
In these idents, the camera moves through a landscape - such as a brutalist housing estate, an American city, a Japanese city a series of pylons - which for a brief moment reveals itself as the Channel 4 logo.
Signs become fleeting structure, for an instance, structure is resolved into meaningful sign.
I've often daydreamed whether it would be possible for architects, urban planners and landscape designers to hide codes and signs into their creations, which would only be revealed when viewed from a certain position.
Google Earth has revealed new symbolism in buildings, such as this Navy base in California:
In the meantime, there's always GeoGreeting.