I think Frandall said a LONG time ago that the sprites were angled at 80 degrees.
(Note: he didn't directly say this, somebody commented that this would probably be the case, and Frandall said "Give the man a gold star.")
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1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11... = pi/4.
pi= 3.14159265358979323846264338327950288419716939937510582097494...
(This message has been edited by some moderator because they all dislike me)