Today's post, Classical Configuration Spaces was originally published on 15 April 2008. A summary (taken from the LW wiki):

How to visualize the state of a system of two 1-dimensional particles, as a single point in 2-dimensional space. Understanding configuration spaces in classical physics is a useful first step, before trying to imagine quantum configuration spaces.

Discuss the post here (rather than in the comments to the original post).

This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Can You Prove Two Particles Are Identical?, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.

Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.