MOREOVER:
it really is a misfortune, IMHO, that the interpratation of 3.142 is, by misfortune as I said, made of the same four numbers that make the most basic sequence in the universe, I mean: 1,2,3,4.
Really, why is there a need to let us know Pi ?! What use can we do of it?
Well, my thought was/is that Pi was indicating the intended shape of the graphical image in the sound. Upon first decoding, the shape we all are used to seeing was not a circle for me, but a weird egg.
Placing the digits of Pi, even in exact numerical order from top center going clockwise (no need to piece it together from some weird order), and even placed around the circle's edge, as though a guide to what Pi is "circling" should be a circle... helps us place the proper aspect ratio of the graphic as a whole.
Perhaps it is human nature to get rid of the egg shape, even before we might study the message to interpret the 3142 circling the circle as perhaps meaning that.
However, I still think this could be a valid explanation of why they might give us Pi, and for what use it was intended (since the guys who encoded knew it could easily be decoded/rendered as an egg).
Not that this *is* the meaning or reason, but again, a perhaps *why* they might.