Sigh, so handsome. But more than that, this is a common expression for my big boy. Quill is probably the smartest kitty to own me. You present Mister Quill with a problem and he'll sit for awhile making this very face; after a time he has figured it out. He even creates puzzles for himself to solve when he's bored.
When I took this picture he was trying to figure out how to look out the window, which is covered by a pleated shade. After much secretive naughtiness, he managed to pry up an edge for his viewing pleasure. It was not satisfying for him though, so he started to loudly pat at the shade with his massive paws. Quill generally keeps his naughtiness on the down low so I was surprised at the loudness of this approach. It even drew some cross words from his Dad.
It wasn't long before he would be at it again - pat, pat, pat. Another thing about Quill is his tenacity - if he wants something nothing distracts him for long. Cut to 3:00 am. From my bed I hear the now familiar patting of the shades. In frustration I got up and opened the shade so I could get some sleep. See smart boy.