I don't display what slabs I have, so I don't know how the ones with Newton Rings would look. I know that those with the rings are seen if I hold the slab just so, but when I do that, I can't see, or at least appreciate the cover. When I move it so I can, I don't see the rings without looking for them. That's me.
In the right light I can understand a wall display looking like a 60s Pink Floyd background projection, but I don't want my books in any light.
EDIT: Oops- Just remembered this is a 'Heating Up' thread. Sorry for keeping it OT.