A Spatial Operating Environment (SOE) with markerless gestural control includes a sensor coupled to a processor that runs numerous applications. A gestural interface application executes on the processor. The gestural interface application receives data from the sensor that corresponds to a hand of a user detected by the sensor, and tracks the hand by generating images from the data and associating blobs in the images with tracks of the hand. The gestural interface application detects a pose of the hand by classifying each blob as corresponding to an object shape. The gestural interface application generates a gesture signal in response to a gesture comprising the pose and the tracks, and controls the applications with the gesture signal.