There is one obvious sensor that I experience often. This sensor is in the doors of the MUNI and it is what keeps the train from moving if someone is caught between the doors. I have been caught between these doors and thanks to these sensors, I do not get crushed, nor does the MUNI move forward with me caught between the doors. I believe that this sensor uses an infrared laser that can detect whether or not an object is blocking the light. By blocking this laser, it is closing the circuit which activates the loud alarm that sounds. From my observations and personal experiences, the loud alarm is overwhelming and draws much attention to the individual caught between the doors of the MUNI.
I think that humans can interact with an art piece through the use of sensors that can detect the presence of a person. A sensor can determine the speed of the person walking through the doorway, and make an assumption of their mood based on how fast or slow they walk. If the person walks really fast through the door, soothing blue lights could be activated to calm the individual.
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