So in writing a field of numbers in a spiral on a surface... one is also giving a two dimensional structure depth. The spiral becomes a one at one end and forty-two at the other, in other words, you are adding a dimension. The spiral can now be viewed much like the rifling in a gun barrel. The pattern seen after circling the primes will be more understandable after one untwists the spiral now that it has a third dimension to be observed in. What do you get... (starting with a square spiral) a well shaded perfect vanishing point 3d hallway I would guess, but perhaps a cube, or the always possible, petunia??? I can only see this in my head, if you can afford to be so kind, will you guys do the cool stuff!? P.S. these guys put a number of spiraling primes thru a single point over time and got and image of shapes (a cross section of a 4 dimensional object)... http://gizmodo.com/5892424/five-years-of-every-nba-shot-attempt-visualized