A new system named Sixth-Sense is proposed for obtaining physical world information in smart space. Our view is object-centered and sensors are attached to several objects in the space. What we focus is to use the smart sensor attached objects to obtain information from no sensor attached objects, i.e., the so called potential objects detection problem. The Sixth-Sense resolves this problem by Sixth-Sense Skeleton and inference rules. A series of inference rules are presented and illustrated.