PComp Sensor Walk

During my short walk around the West Village, I saw a number of sensors; the majority of them were simple buttons, including buttons to change traffic signals, buttons to buzz doorbells and intercoms, buttons to call for emergency help, and buttons to interface with an ATM. The payphone, also rife with sensors, sat alone and unused.

I couldn’t determine if the brake on this bike qualified as a sensor. The same with this light – does it activate when it senses movement, or is it just turned off and on elsewhere?