Online images of the cover look like this:
In the flesh the front and the spine are at first nothing but a regular pattern of white dots on black: there doesn't seem to be anything there. But if you tilt it or look at it from a distance (or, I found, through a camera viewfinder), the image, title and author name appear. To get something of the effect, look at the small versions below, then click for the full-sized versions. Really, though, you probably need to see the physical object--bookshops should soon be full of people squinting at this book, trying to get to grips with it.
Unhelpfully, no designer is credited on my copy (the Commonwealth-outside-the-UK edition), so if anyone in the UK sees the dustjacketed hardback, and it has a designer listed, I would love to know who came up with this.