Thatness is not a quality, despite the 'ness', it is orthogonal to whatness. What you can conceive of it its name is however a quality as of being, so you need to quietly 'boil off' the whatness, until you are left with pure that. That's it. Close your eyes and open them again, the world is there, your seeing, but find it the instant before it worlds. That is the wonder, or just this.