My cat has a favorite cat tree, with her favorite view of the street below. I'll open the window for her so she can see a little better through the screen, and she'll sit there for hours just watching the leaves, the birds, and all the people. Sometimes when she's really focus, i'll sneak up next to her and watch with her. She'll give a little chirp as if to say hi to me, but she won't move her head. She'll just keep watching, and purr while we watch out the window together.
I love my cat!