Bird brain

Our drawing room overlooks the hills and has big glass windows and doors. Lately, a bird has taken a fancy to something inside and keeps hitting the glass while trying to fly in. Obviously the door and windows are closed, but it still keeps trying. I wonder what’s caught its fancy and why does it not realize that the glass is blocking any chance of him/her entering (I think it’s a he).

I tried propping a cushion from inside to block his view. He was quite for a little while but started hitting above the cushion after a few minutes. If I see him continue tomorrow, I’m going to try out a few more experiments to see if I can get him to stop the madness (or whatever ideas his bird brain has)