The Windhover Contemplative Center at Stanford University features rammed earth walls juxtaposed with the lightness of glass windows and the serenity of the surrounding oak grove. (Photo courtesy Aidlin Darling Design)

The Windhover Contemplative Center at Stanford University features rammed earth walls juxtaposed with the lightness of glass windows and the serenity of the surrounding oak grove. (Photo courtesy Aidlin Darling Design)