Smartphones have some sensors inbuilt (such as GPS to sense your location) but we have developed the expertise to implement a range of sensors external to the phone in order to create responsive, interactive environments. These sensors can respond to a visitor's actions, or what is done on a phone (such as solving a puzzle). They can sense proximity, movement, vibration, knocking and clapping, and can be used in conjunction with objects such as motors, doors, lights, bells and whistles! See here for more details.
