Keyboards are a necessary part of today’s computers, right? Maybe not for much longer. A group of scientists have used acoustic sensors to turn wooden tabletops and even three-dimensional objects into a new type of computer interface. Sound vibrating a windowpane or through a tabletop is something most people experience daily. Sound waves travel well through most solid materials. Now, researchers have exploited the excellent propagation of sound waves through solids to turn everyday objects — including 3D objects — into a new kind of computer interface.