A space HGTV Dream Home 2011 architect Paul Robert Rouselle coined a "peninsula of glass," the annex boasts three walls of windows that project into the wooded backyard.

A welded and painted steel sculpture by artist Charles Orme floats like a cloud above the seating area.

An adjustable floor lamp with drum shade brightens the space on gray days.

Casual leather recliner chairs and ultrasuede pillows tell a toned-down story in the annex. "We kept that room very neutral because I think of it as a treetop room," says interior designer Linda Woodrum.