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From: Margolin@MIT-MULTICS.ARPA
Newsgroups: net.sf-lovers
Subject: Planiverse: x-y vs. x-z
Message-ID: <1196@sri-arpa.UUCP>
Date: Thu, 24-May-84 19:26:00 EDT
Article-I.D.: sri-arpa.1196
Posted: Thu May 24 19:26:00 1984
Date-Received: Fri, 1-Jun-84 04:20:50 EDT
Lines: 13

From:   Barry Margolin <Margolin@MIT-MULTICS.ARPA>

In V9 #99, Greg Skinner complained about the fact that up and down are
used in "Planiverse".  That is because he thinks about a 2-D world by
laying it out on his table.  In the book, all direction references are
made relative to a Planiverse resident.  "Up" and "down" mean the same
thing to them as it does to us:  towards the center of the planet.
Thus, even if you placed the 2-D world on the wall, your "up" wouldn't
necessarily correspond to the "up" of a resident of the 2-D world.  One
thing to notice in the book:  most of the time, references to lateral
directions on the Planiverse planet (whose name escapes me) are done
with "east" and "west", not "right" and "left".
                                        barmar