"We will dip into the red ribbon trail here, which is going to go into the ancient forest. That's this dark green layer on the map, also known as the cathedral woods, or the old growth forest. That's land that's really been untouched."

Tolly Kaiser, a rising sophomore at Bowdoin college, is leading his daily tour group into the woods on Monhegan Island.

Anyone who has spent time on Monhegan, a small island 10 miles off the coast of Maine, knows how much artists love to paint there. Famous artists like Hopper and Kent have captured the light and landscape of the island going back over a century. Now, an exhibit from Bowdoin College and the Monhegan Museum is using that rich artistic body of work as ecological data.

Armed with a laminated stack of images of paintings, Kaiser, the summer i

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