sensing, by the mobile device at least one of a movement of the captured entity and {TAIL ~ a change} of size of {HEAD ~ the captured entity} according to a movement of the mobile device 
sensing , by the mobile device at least one of a movement of the captured entity and { TAIL ~ a change } of size of { HEAD ~ the captured entity } according to a movement of the mobile device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH