Answer:
To cross the water I'm the way. For water I'm above I touch it not and truth to say I neither swim nor move.
What can fill a room but takes up no space?
I go through a door but never go in, and never come out. What am I?
I have wheels and flies yet I am not an aircraft.
The more you have me, the less you see. Shine a light on me and I flee. What am I?
The answer I give is yes, but what I mean is no. What was the question?