&hint1=I cast shadows according to the movements of the sun and the moon& &hint2=My "windows" are arranged according to the primary compass points& &hint3=The artist who created me was inspired by stone henges& &hint4=I am two concentric circles of mountain stone& &choices=Chamber tomb, interior;Stonehenge;Standing stones;Stone Enclosure, Rock Rings;Solar Rotary: Sundial;Heelstone& &answer=Stone Enclosure, Rock Rings& &search=Nancy Holt& &title=Stone Enclosure, Rock Rings& &artist=Nancy Holt& &medium=Hand-quarried schist& &date=1977-78& &location=Western Washington University, Washington, D.C.& &dimensions=Diameter of outer ring 40', height of ring walls 10'&