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The Bottle Wall is a "wall" which is located in public place and designed to collect empty beverage bottles and use them to exhibit public service announcement.
There are lattice slots which are tidily arranged on the wall. Every single slot is able to accept an empty bottle and can be switched to close or open. There will be a prompt on open slot to encourage people put their empty bottle into the slot. Finally, the open slots which have been filled with different bottles will form some letters and simple graphics on the wall. People will have fun in it, everyone wants result. The content also can be easily changed by controlling the slots.