Pigs love to scratch, or so I found out when making a sound installation at Stone Barns. Its part of "Garden of Sonic Delights" produced by Caramoor Center. My installation "Seven Bells for Stone Barns" includes bells rung by gravity,sunlight, weather, wind, bees, water, pigs, sheep and bees. The more you listen the more you hear, but you might have to wait. Nature is not controlled by your ap. Stone Barns Center for Sustainable Agriculture is in Pocantico Hills NY, and the installation is open till Nov 2014. Come listen.