The fence is becoming an increasingly popular hangout spot. A couple of days ago both cats hopped up at once and created a logjam. Domino couldn't figure out how to get down with Inkblot in the way, so she headed off in the wrong direction and got stopped by the rose bush. After convincing herself there was just no way through a big mass of thorns, she turned around and hopped down onto the air conditioning unit. Apparently Inkblot hadn't counted on that bit of trickery, which meant there was no longer any point in blocking the way. So he headed over to the bird bath and hopped down too. I still don't know for sure how they get up there, though.