I read the PhotoReading book 2-3 days ago and one of my difficulties was to see the "blip" page. I tried what you described holding the book while I focus on the wall but it didn't work. So I tried to use the other technique described in the book: noticing the white spaces of the open book and seeing the cross on the page. That's how I first managed to PhotoFocus (amazing experience!). After this first experience I continued using the same technique until last night while practicing I just saw the "blip" page!
I am sure it will just come!
Good luck
