"I love a good puzzle," says Bill, "and I'm convinced that the more constraints there are on a project, the more my imagination is pushed, and therefore the better the result becomes." So Bill began to work and found that there were plenty of constraints to inspire the design. "We had some pretty strong feelings about letting the existing landscape drive the plan," Barbara says. "We didn't want to take down any trees, and we wanted the house to work with the landscape. So I guess the design was an evolution of sorts."