Answer:
A device for finding furniture in the dark.
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What is it?
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
What word starts with 'E', ends with 'E', but only has one letter? It is not the letter 'E'.
It rows quickly with four oars but never comes out from under his own roof. What is it?