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And the sensors are picking up my agitation - my heart rate shoots up and my skin is sweating more.

Some of their conversation in the flat was recorded on a spy camera beside Zou's bed, which was triggered by a motion sensor.

For a 2007 exhibition at LAXART, he installed a large glass cube with an LED display that reflected pollution sensors around Los Angeles.

But they are equipped with sensors that reveal the extent of methane, turning this invisible gas into concrete numbers on a screen.

Throughout the winter and early spring, state water officials use a network of snow sensors combined with manual surveys across the Sierra Nevada to measure the snowpack.