Dear Tom,I believe this is from an old 1978 poster that IBM released dealing with virtual memory. It is sometimes attributed to Scott Hammer, who worked at William and Mary before I got here as a graduate student. Here is him explaining that this is the first time he saw it: http://www.netfunny.com/rhf/jokes/92q3/seeit.htmlHope that helps.Sincerely,Nabeel SiddiquiOn Thu, Oct 30, 2014 at 11:02 AM, James Cortada <jcortada@umn.edu> wrote:By the way, Mike is alive and well. Mike can you pipe in and confirm. This is a fabulous insight and expression. It should be quoted frequently!!Cheers.--On Thu, Oct 30, 2014 at 9:24 AM, David Hemmendinger <hemmendd@union.edu> wrote:>I heard it from Mike Williams, when he had his professor of computer science hat on! Here's how he said it:
>
>If it is there, but you can't see it, it is transparent.
>If it isn't there, but you see it, it is virtual.
>If it is there, and you see it, it is real.
>
>For the purposes of symmetry, what if something is not there and you can't see it?
If it isn't there and you can't see it, you're ok.
David
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James W. CortadaSenior Research FellowCharles Babbage InstituteUniversity of Minnesota
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