Inside Out

I have a secret treehouse.
It fits inside the tree.
When rain and sleet come falling down
it»s cozy as can be.

My friends would like to have one, too,
but I don»t know, you see,
where they could find another one
or if, like mine, it»s free.

My tree looks like all other trees
except for what»s inside
and who would think that all that bark
could have so much to hide.