>A man  breaking his journey between  one place and  another at a third  place  of  no  name, character,  population  or significance,  sees a unicorn cross his path and disappear.
That in itself is startling, but there are precedents  for  mystical encounters  of various kinds,  or  to be  less extreme, a choice of persuasions to  put it down to fancy; until - "My God," says the  second man, "I must  be dreaming,  I thought  I saw a unicorn."
At which point, a dimension is added that makes the experience  as alarming  as it will ever be.
A third  witness, you understand, adds no further dimension but  only  spreads it thinner, and  a  fourth thinner  still,  and  the more witnesses  there are, the thinner it gets and the more reasonable it becomes until it is as thin as reality, the name we give to the common experience...
"Look, look" recites  the crowd. "A horse with an arrow in its forehead!  It must have been mistaken for a deer."
I'm sorry it wasn't the unicorn. It would have been nice to have unicorns...<

Tom Stoppard  >Rosencrantz and Guildenstern are Dead<.