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The robot in the short film is on a rail system that's flush/built into the ground. From the clip it looks like the junctions are connected to a main rail.

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Railings go from the kitchen area and terminate at the tables

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Restaurant in Germany uses railing systems to deliver food to their customers

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This company designs and makes modular storage and railing systems. These pictures show some configuration and parts

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http://www.italmodular.com/company/

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The rail allows for example a robotic arm to be able to move around on the ceiling of any room.

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It requires the door to be open before the robot can enter the room.

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Railing all rooms to allow a robotic companion to enter the room.