Invisible digital post-it notes
from Mobile Technology (736 articles)
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Digital messages can be attached to pictures of a local sight to provide information about the building. The radius in which the message can be received can be selected by the writer of the message. Buildings visible from far off - the Acropolis in Athen, for instance - can be given a larger radius of a few miles enabling tourists to read the graffito as well from a long way away.
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