I am not sure the fascination with looking out the window (other than curiosity of the big, wide world) but the trio love to play by the windows and windowsills. Right now, the depth of the sill is the perfect size for thier tiny hineys.... and is a great sit-about. (Just as long as mommy keeps the windows closed - EEK!) I am sure that it helps that we can occasionally see a duck outside, too. (Yep, there is a small pond not to far from our backyard...)