I have been putting together my tentative half of a syllabus for a course on the Visual Arts and Invisibility - and hence reflecting on the representation or imagination of what isn't there. What's very patently not there in this house are the cats (except via Skype from Santa Fe). I keep imagining that I see one of them, out of the corner of my eye; or I wonder if their litter needs changing; or I think I hear one of them - but no (there's a lot of all too visible weather this evening, though, which is probably responsible for some of the odder sounds).
Invisibility covers all kinds of ghostly things, and I found it decidedly spooky that when I thought I'd opened this image in Photoshop, it just wouldn't make itself seen. I had to exit PS and enter it again, as though it was deliberately and maliciously acting out my train of thought for the last couple of hours.