Every time I walk past the Modern’s Cornwall Summer Circle, 1995, by Richard Long, it reminds me of Stonehenge. The two structures share the obvious circular/stone construction, but there are also underlying elements of ritual and a shared sense of void. (Stonehenge is composed of a series of concentric circles, formed by monumental rocks that were hauled and placed there by Neolithic people in three phases beginning around 3100 BCE. Long’s Cornwall Summer Circle is a single circular outline populated by 237 slate stones.)