I took a stroll around my neighborhood (clinton hill, brooklyn), paying attention to, and taking photos of sensors that I encounter with my digital camera.
The first one I found just outside my house was a sensor light, which probably detects nearby motions and automatically turns on the lights when a someone passes under it. It might also have a light sensor to turn itself on when it gets dark, because it didn't seem to be working during the daytime:
I then crossed the street, where a traffic control box with a push botton was installed, which I hadnever noticed before because I had never seen anyone use it.
then a telephone booth, with the usual dial buttons:
and another sensor light:
and doorbells, plenty of them:
Not much of extraordinary discoveries. However, as I turned around and headed home, I started hearing a faint sound of what seemed to me a recorded voice of someone. I looked around but there was no one talking. I kept walking but the voice seemed to follow me. I was puzzled. I stopped, listened again, and finally found out that the voice was coming out of the cellphone in my pocket. My walking had accidentally pressed the voice speaker button placed on the rear side of the phone, and activated its voice control program. So that was another sensor, which I had carried all along this sensor walk:
After returning home, I uploaded the photos I took from the digital camera to the computer. And at that moment I discovered yet another sensor (actually a bunch of sensors, including even a "face detector") that I had been carrying throughout my sensor walk without noticing its presence:
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