Carpet moat

You've got your sofa fort, you feel safe and secure, but are you really? What's to stop maruading hoards from pounding at the gates? Obviously, you need a carpet moat*.

With a carpet moat, you can keep pillagers at bay (they can't cross the wide colored stripe) while you have at them with:
hot oil**
rocks**
archers**
flaming liquids**
etc.

Comes complete with drawbridge attachment for your sofa fort.

*Not effective against missile weapons.
** Sold separately

(Yes, it's more a rug than a carpet, but neither Moat rug nor Rug moat sounded quite right.)