As it turns out, you don't need sleight of hand or even mud to design gravity-defying cairns. You do need a bit of patience, though, and a knack for "knowing the rocks," according to Michael Grab, an land artist who has been balancing rocks since 2008. He builds his sculptures with rocks from the natural landscape, usually alongside water.
A new sculpture trail in Pendle Hill, England winds through the rural landscape and commemorates the 400th anniversary of an historic witch hunt. The site-specific pieces were designed with local materials and inspired by Pendle Hill's dark history.