This modern house designed by Arch11 is a place where the domestic life of a young family weaves with the values of two professional athletes and the outdoors. Where this distinction may separate those roles, lines in this structure seeks to bind and integrate. Anchored on a downtown corner site, this Boulder, Colo. home has an all glass living room and Site-cast, board-formed concrete walls. The latter both moors the building to its site and provides thermal mass to control temperature swings. The house is organized around crossing dihedral lines--one phenomenal and one tectonic—that shear the interior volumes.