FOR SALE: Martis Camp, Truckee. Relentless is a term that rarely comes into play when selling homes. But perhaps that word best describes this 9,000-square-foot home whose graceful, artistic lines and elements of surprise are seemingly never-ending. Beyond its alluring exterior of form concrete, radiant wood and black iron beams is a house that feels like home while also projecting the personality of a museum of modern art. It’s a dream scene for entertaining and living.