Answer:
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
What is always coming but never arrives?
The more holes you cover the lower I go.
Iron roof, glass walls, I burn and burn but never fall. What am I?
What is light as a feather but even the strongest man cannot hold it for more than a few minutes?
The answer I give is yes, but what I mean is no. What was the question?