Signposting is a unique medium, since it addresses only one of our five senses: the sense of sight. This is the sense most used by people on the move, which is why it is so difficult to address. If the sign is too discreet, it will pass unnoticed; if it is too imposing, it will interfere with the viewer's overall interpretation of his or her environment. Successful signposting must identify the receiver and sender of the messages it wishes to convey: Who is the speaker and to whom is the message addressed? It must adapt to the existing "built-up environment" while delivering messages of welcome, guidance, information and identification to the "receiver". As an integral part of the building, signposting must discreetly highlight its organisation and function while taking into account the needs of permanent occupants and occasional visitors. If it is too insistent, it overwhelms the occupant; if it is too subtle, it irritates the visitor. Signposting systems are structurally attached to a building but functionally
dependent on the "sender" of the message. Thus, they must combine
the permanence of the man-made object with the open-ended potential of
their "living" content. The difficulties of reconciling all these contradictions means that signposting often fails to hit the right note - in other words, fails to combine a sound grasp of many complex factors and a well-thought-out procedure.
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