Sorry!

I'm sorry that I have not posted the answer of the riddle.
The answer is a chimney.

A Riddle.

Black within red without,
With four corners round about.
I'll post the answer tomorrow.

Sponsoring me.

My grandma is hosting a walk-a-thon for St. Jude's children's hospital and I am participating. For more info on it go here. I have to get sponsors to participate. Please will you sponsor me?
If you will, then please leave a comment. Thank you.