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- From: hagerman@ece.cmu.edu (John Hagerman)
- Subject: Re: Gravity & Rubber Sheet Analogy Problem
- In-Reply-To: dseeman@novell.com's message of Tue, 12 Jan 1993 21:25:29 GMT
- Message-ID: <HAGERMAN.93Jan12211333@rx7.ece.cmu.edu>
- Sender: news@fs7.ece.cmu.edu (USENET News System)
- Organization: Carnegie Mellon University
- References: <79814@hydra.gatech.EDU> <1993Jan12.175947.18005@novell.com>
- <1993Jan12.212529.21816@novell.com>
- Distribution: usa
- Date: Wed, 13 Jan 1993 02:13:33 GMT
- Lines: 17
-
- I don't understand why the rubber sheet analogy is so bad (but maybe I
- don't understand the analogy). The point of the analogy is to explain
- how space can be "distorted," because this is a non-trivial concept.
- The rubber sheet analogy illustrates this by showing distortions of a
- 2-dimensional space. It is not sufficient to show the distorted sheet
- to someone and say "see, this is what distorted space looks like." It
- must be explained that one must envision oneself being a 2D creature
- confined to the rubber sheet, and that the interesting thing is what
- space looks like in the presence of distortions. The fact that the
- distortions occur because the sheet is deformed in 3-space is not part
- of the analogy. Once one begins to understand what a "distortion" is,
- the analogy becomes less useful, although it's still fun to drop coins
- down the big funnel at the store.
-
- - John
- --
- hagerman@ece.cmu.edu
-