"Mind": Trained By Senses

Count the black dots (or here:
http://208.56.173.213/learningctr/dots2.htm):

From the Institute of General Semantics site:http://208.56.173.213/learningctr/dots3.htm

If we 'see' black dots when there are
only white dots ... what else do we 'see' that's not
there? At home, at work, in our relationships,
among friends, etc. Can you recall a situation in
which you saw what wasn't there; heard what wasn't
said; understood what wasn't intended?