This is a "mouse door" that someone built into their house using doll house parts. Seemed fun to me, although I would have to go with a round top door. It may be the only round top door I could afford.
Cast Iron Mouse \ Rustic Door Stop. Product Dimensions: x This petite little mouse, made from cast iron and featuring charming details, will always stand ready to prop open your door or prop up your books. Door stop.
All You Need Is One Tea Bag and You Will Never See Mice or Spiders In Your House Again!