Apropos of nothing, I thought I'd post a picture of the chambered tomb at Isbister, in the Orkney Islands. In 1985, thanks to a travel prize from my high school, I spent the summer bicycling around the Highlands and Islands of Scotland, looking at Neolithic tombs and standing stones. I made it as far west as Uist and as far north as the Shetlands, racking up more than a thousand miles on my bike. The archaeological impulse subsequently deserted me, but I still have piles of photos and notes from that expedition. The day I was at Isbister, the fog was so thick that I could see hardly more than a few feet; I took the picture above when the mist lifted a little, for a moment. Otherwise, the scene was set mostly by sound — the cries of birds, the roar of an invisible ocean.