“But oh!” thought Alice, suddenly jumping up, “if I don’t make haste I
shall have to go back through the Looking-glass, before I’ve seen what
the rest of the house is like! Let’s have a look at the garden first!”
She was out of the room in a moment, and ran down stairs—or, at least,
it wasn’t exactly running, but a new invention of hers for getting down
stairs quickly and easily, as Alice said to herself. She just kept the
tips of her fingers on the hand-rail, and floated gently down without
even touching the stairs with her feet; then she floated on through the
hall, and would have gone straight out at the door in the same way, if
she hadn’t caught hold of the door-post. She was getting a little giddy
with so much floating in the air, and was rather glad to find herself
walking again in the natural way.

Through the Looking-Glass, and What Alice Found There, Chapter 1 - Looking-Glass House