Looking at some antique maps, where the particulars of a particular place might be accurately drawn but then stuck on to a guess, or a large expanse of blank space, and it's like that now isn't it? Even with the pinpoint accuracy of Cassini and the Hubble, the larger picture's filled with blanks and guesses. The immediate reaction is to think I mean two-dimensional mapping like the maps were but I don't. Space is 3-D. And our 3-D view is like a competent 16th century navigator's. Honest and accurate as far as it goes, but the overall shape and pattern has yet to be drawn.