IN the snowy woods of a valley west of this college town, John and Mary Beth Cook have taken up a version of mountain living amended for the modern world. Last year, they completed and moved into a house that looks like many others here in Big Sky Country, with exterior walls formed by logs stripped of their bark. Except that in their case, the logs are made from precast concrete shaped and painted to look like the real thing.

“We like the look and feel of logs because they look like the forest, they look like they belong,” said Mr. Cook, a historian, teacher and outdoorsman who also installed a climbing wall on his rock chimney. “But we didn’t want the maintenance.”

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