This is the building I built, in front of the water feature. The 'window' on the right is a doggie door that has a swinging flap that closes with strong magnets. I will open this flap/window, sit inside the building and photograph birds that come to the water feature. The inside of the building is about 4' x 6', just big enough for my dogs and me. It has a small free standing heat and air conditioning unit in it, so I can comfortably photograph birds during the HOT/HUMID Arkansas summers.