{HEAD ~ The display} of a human figure is changed based on {TAIL ~ a change} in viewpoint/orientation of the device 
is changed based on
{ HEAD ~ The display } of a human figure is changed based on { TAIL ~ a change } in viewpoint / orientation of the device
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH