A

If you can	see	it and it is	there	it is	real
			not there		virtual
	not see		there		transparent
			not there		gone

B

If you can	see it and it is	there it is real
		not there it is virtual
	not see it and it is	there it is transparent
		not there it is gone

C

If you can see it and it is there it is real.

If you can see it and it is not there it is virtual.

If you can not see it and it is there it is transparent.

If you can not see it and it is not there it is gone.

D

If you can     see it and it is     there it is real.
If you can     see it and it is not there it is virtual.
If you can not see it and it is     there it is transparent.
If you can not see it and it is not there it is gone.

E

If you can ... it and it is ... it is ...
	there	not there
see	real	virtual
not see	transparent	gone

F

If you can ... it and it is ... it is ...
	there	not there
see
not see

G

What is virtual?
Question	Answer
If you can see it and it is there it is
If you can see it and it is not there it is
If you can not see it and it is there it is
If you can not see it and it is not there it is