Well put Jackie--
In reply to:

Example: I come home from school with the illusion that I have done well on a test.
If I find I did in fact get a good grade, then my illusion turned out to be correct.
If I come home saying I did well on the test, even though I put wild guesses for answers, that is a delusion.


and a "magician" is now often called an illusionist-- we know that they are not really sawing the woman in half, pulling rabbits out of hats--but we are not deluded- even as we "see" something that we know is not logical or sometimes even possible.

If we thought the illusionist was really perfoming magic-- and was really cutting the woman in half, and then rejoining the parts-- that would be delusional.