Forgive me if I'm being dense, but was it not you that introduced the word 'illusion' in this exact context into the thread?
Well, you used the word here:
http://www.internationalskeptics.com/forums/showthread.php?postid=9845813#post9845813
Then you mentioned it in a different context:
http://www.internationalskeptics.com/forums/showthread.php?postid=9883746#post9883746
Here you use the word in the context you claim not to understand:
http://www.internationalskeptics.com/forums/showthread.php?postid=9944197#post9944197
Jabba, I'm really not trying to be confrontational or rude, but why would you use a word/phrase/context that you later claim not to understand?
Google is a marvellous free resource (other search engines are available) which is literally* at your fingertips. There is no good reason to remain in a fog of misunderstanding or in ignorance of meaning.
*In the proper meaning of literally, not the newly coined usage meaning "not actually literally".