A riddle in two lines: black within and red without, four corners round about. Let a child guess before giving away that it is a chimney.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Black within and red without;
Four corners round about.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition