Yeah - I think it's kinda like a maze when it's done.*
  [1]https://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Ulam_spiral_howto_all_numbers.svg/2000px-Ulam_spiral_howto_all_numbers.svg.png
  you take all of the numbers, starting with one, and go around
  and around. Imagine erasing all of the numbers that AREN'T prime
  numbers, so that there is only prime numbers left. That's what
  makes up the maze.

References

  Visible links
  1. https://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/Ulam_spiral_howto_all_numbers.svg/2000px-Ulam_spiral_howto_all_numbers.svg.png

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