My cat Caesar seems to have a weird attraction for glass or reflective
surfaces.  Often I will hear the glass door outside rattling, and it's the
cat squeeking his paw up and down it.  He doesn't want out or in usually and
acts clueless if I open the door.

Often he will jump up on the sink when I am in the bathroom and wipe the
glass mirror.  I thought perhaps he was doing something with steam from the
shower, but he also does it without steam.

I thought this was just a quirk, but lately he's also climbed precariously
up to a high bedroom mirror to rub the surface of that, and I've found him
up on the couch doing the glass in a picture frame.  It's like he's testing
all of the reflective surfaces in the house.

Do we need to dust more often, or is this some type of explainable behavior?
Caesar often will put a paw on you almost the same way a human would touch a
pet...sometimes he feels like he's comforting in a "there there" type of
gesture.

Any ideas?