A schematic interaction chart showing the communication between a user and the installation:

User sends text message to Aleph with name of place e.g.: NEW YORK
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Case A: NEW YORK is in list of possible places.
Aleph sends a confirmation: THANK YOU FOR CHOOSING NEW YORK.
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Case B: NEW YORK is not listed.
Aleph sends the current list as text message to the users mobile phone.
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The user sends her choice from the list e.g.: BERLIN ————————————————————————————————->

Aleph updates the LED screens and place signs.
Aleph sends a confirmation: THANK YOU FOR CHOOSING BERLIN
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