Watch: Mama cat both lovingly and absent-mindedly pets her kitten

So cute!

I can’t figure out the “out the window” part. Can someone help me? My brain isn’t making sense of the picture. It looks like the furniture extends through the opening? At 0:08 it looks like the top of the chair is behind the window shade. Is that just an opening into another interior space that happens to have a window-shade-like covering?