 Stand right in the middle and just clap When you see strange reactions from people clapping in the middle of the circle It's because they're hearing a squeak coming from the tiles The clapping circle is a piece of landscape architecture on the Purdue campus That produces a strange acoustic effect due to the grooves in the plaza itself When students or anyone stands in the middle of the circle and claps They hear reflected back to them a descending pitch that is actually created from the reflections from the tiles It was great to get this metal based on our group's joint efforts to solve a Purdue mystery The MDE Acoustics program is giving the Purdue students a really good education And that Purdue has the resources to teach a great understanding of acoustics to its students even on the undergraduate level