The artist Scott Kildall is waving his hand over the contours of a Joshua tree, just inches from its spiky green, bayonet-like leaves. "If I get too close to it, it will prick me and draw blood," he ...

Scientists have long studied how near-infrared light bounces off forests and grasslands, as a proxy for plant health. Now, an artist is using the same trick to turn the Joshua tree into an instrument.

Artist Scott Kildall waves his microcontroller over a Joshua tree, recording wavelengths of light that are not perceptible by humans. (Carlos Jaramillo for NPR) The artist Scott Kildall is waving his ...

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