A senior moment or a Kindle moment?

Oh dear, how to explain this without sounding really stupid. I resolved this week to read A Sense of an Ending for next week's book group meeting and so went to download it onto my Kindle. Not entirely to my surprise, it was already there; I had obviously thought about reading it before. And so I started to read. It felt a little familiar from the start but I assumed that I'd heard extracts on the radio in the pre or post Booker publicity storm. And so I read on. Eventually, about one third through the book I realised that it was familiar because, prepare to be shocked, I had read it before. I have no memory of where or when. What an admission. Now, a few days on, I have determined that this is less of a senior moment than a Kindle moment. I love my Kindle but I'm blaming it for this incident. The problem with a Kindle is you have no mental image of a book - of how thin or thick it is, the illustration on the cover and the blurb on the back, the font or the feel of it. After all, it couldn't be my memory that's at fault, could it?