“To begin with it was hazy, the past foggily imposed upon the present, then the present would slowly fade and the past came in, real and solid. But it’s different now. Once in a while there’s a bit of flickering as the present gives way to the past—but mostly it simply changes, as if at the snap of a finger. The present goes away and I’m standing in the past. The past is all around me. Nothing of the present is left.”

“But you aren’t really in the past? Physically, I mean.”

“There are times when I’m not in it at all. I stand in the present and the distant hills or the river valley changes. But ordinarily it changes all around me, although the funny thing about it is that, as you say, I’m not really in it. I can see it and it seems real enough for me to walk around in it. I can walk over to a tree and put my hand out to feel it and the tree is there, But I seem to make no impact on the past. It’s as if I were not there at all. The animals do not see me. I’ve walked up to within a few feet of dinosaurs. They can’t see me or hear or smell me. If they had I’d have been dead a dozen times. It’s as if I were walking through a three-dimensional movie. At first I worried a lot about the surface differences that might exist. I’d wake up dreaming of going into the past and being buried up to my waist in a rise of ground that since has eroded away. But it doesn’t work that way. I’m walking along in the present and then I’m walking in the past. It’s as if a door were there and I stepped through it. I told you I don’t really seem to be in the past—but I’m not in the present, either. I tried to get some proof. I took a camera with me and shot a lot of pictures. When the films were developed there was nothing on them. Not the past—but what is more important, not the present, either. If I had been hallucinating, the camera should have caught pictures of the present.