Sound benches: The parabolic benches outside of Building 18 are a popular place to study when the weather is nice. Try standing at the focal point of either parabola and making a sound! Yuanyu Chen—The Tech May. 9, 2016 Facebook Twitter Reddit Print Sound benches: The parabolic benches outside of Building 18 are a popular place to study when the weather is nice. Try standing at the focal point of either parabola and making a sound! Yuanyu Chen—The Tech