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This paper gives a geometric treatment of the source encoding of a Gaussian random variable for minimum mean-square error. The first section is expository, giving a geometric derivation of Shannon's classic result  which explicitly shows the steps in source encoding and the properties that a near optimum code must possess. The second section makes use of the geometric insight gained in the first section to bound the performance that can be obtained with a finite block length of random variables. It is shown that a code can be found whose performance approaches that of the rate distortion function as in mean-square error and in rate.