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