controlling, by the display apparatus, at least one of {TAIL ~ the size} and {HEAD ~ position} of the displayed entity according to the first control signal 
controlling , by the display apparatus , at least one of { TAIL ~ the size } and { HEAD ~ position } of the displayed entity according to the first control signal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH