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		<id>https://www.explainxkcd.com/wiki/index.php?title=485:_Depth&amp;diff=391507</id>
		<title>485: Depth</title>
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				<updated>2025-11-24T05:58:24Z</updated>
		
		<summary type="html">&lt;p&gt;2601:300:4083:1C70:C442:2C72:39EC:66D6: &amp;quot;sexytimes&amp;quot; how did nobody edit that out after all this time&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 485&lt;br /&gt;
| date      = October 6, 2008&lt;br /&gt;
| before    = [[#Explanation|↓ Skip to explanation ↓]]&lt;br /&gt;
| title     = Depth&lt;br /&gt;
| image     = depth.png&lt;br /&gt;
| titletext = The Planck length is another thousand or two pixels below the comic.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
The comic is a companion piece to [[482: Height]], which explored a {{w|logarithmic scale}} from the edge of the observable universe down to the Earth's surface. ''Depth'' continues the process, viewing logarithmically smaller scales from Earth's atmosphere down to the interior of a single {{w|proton}}. This combination is reminiscent of Charles and Ray Eames' 1977 short film [http://youtu.be/0fKBhvDjuy0 Powers of Ten].&lt;br /&gt;
&lt;br /&gt;
Here's a walk through the entire comic:&lt;br /&gt;
&lt;br /&gt;
* At the top, we see a cutaway view of a story apartment complex. From left to right, different activities can be seen in the apartments; [[Megan]] and [[Cueball]] playing in a ball pit, Megan {{w|exorcising}} {{w|Windows Vista}}, [[Ponytail]] and Megan playing ''{{w|Guitar Hero}}'' or a similar game, Cueball at a desk, and what appear to be people having sex.&lt;br /&gt;
* The view descends into Cueball's tower PC.&lt;br /&gt;
* Entering the computer's internals, we see a mouse plugged into the PS/2 (6-pin mini-DIN) connector. This is a visual pun, since the mouse is an actual rodent and not a handheld device.&lt;br /&gt;
* Next, we dive into the CPU. We see a multi-layered pun on the question &amp;quot;how many angels can dance on the head of a pin?&amp;quot; There may be a pun with a chip's connector pin, but the more obvious reference is Randall's answer of 32,767 = 2&amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt; - 1, the largest possible value of a signed 16-bit integer. Adding one rolls back over to -32,768, which is 32,768 devils or &amp;quot;negative angels.&amp;quot; (See [[571: Can't Sleep]] for a similar joke and a more elaborate explanation.)&lt;br /&gt;
* A blood-sucking mosquito appears to be &amp;quot;leeching&amp;quot; a torrent.&lt;br /&gt;
* A {{w|segfault}} is a problem with memory access.&lt;br /&gt;
* {{w|Dust mite}}s are small arachnids that feed on house dust and are known to cause allergies.  {{w|Rust mite}}s are very small mites that live on plants and cause discoloration of leaves and fruit, or small galls.&lt;br /&gt;
* We zoom in on a memory unit on the CPU. Cueball is being {{w|rickrolled}}, as indicated by the label &amp;quot;pixel on {{w|Rick Astley|Rick Astley's}} shoulder.&amp;quot;&lt;br /&gt;
* A &amp;quot;fork();&amp;quot; command points at one of several unlabeled spermatazoa. Forking and sperm are capable of spawning &amp;quot;child processes.&amp;quot;&lt;br /&gt;
* {{w|Peter Norton}} is the founder of {{w|Norton Antivirus}}. He is shown fighting a biological virus, rather than informatic malware.&lt;br /&gt;
* Showing the relative scale of {{w|carbon nanotubes}}, the suggestion is that these then lead on to a more megastructural {{w|Space Elevator}}, for which carbon nanotubes are often cited as a suitably strong component needed for the cable.&lt;br /&gt;
* We soon zoom in on a silicon atom in the CPU. In the {{w|electron cloud}}, the squiggles made out of arrows are {{w|Feynman diagram}}s. A Feynman diagram in the shape of a stick figure is saying &amp;quot;Sup?&amp;quot;, a pun on the &amp;quot;Sup&amp;quot; particle (supersymmetric partner 'squark' to the Up quark) and an abbreviation of the greeting &amp;quot;What's up?&amp;quot;&lt;br /&gt;
* An 'iPod Femto' is shown, as a pun on the '{{w|iPod Nano}}' (both are {{w|SI prefixes}}), both of which refer to units far smaller than any iPod that has ever, or likely will ever, be created.&lt;br /&gt;
* {{w|Brian Greene}} is a theoretical physicist and {{w|Popular science|pop scientist}} who discusses the nature of the universe. The picture of him knitting is a pun on {{w|string theory}} and PBS miniseries {{w|The Fabric of the Cosmos}}.  The term 'knitting furiously' shows up in the 1857 Volume 14, page 46 (available via [https://babel.hathitrust.org/cgi/pt?id=uva.x004827161&amp;amp;seq=54&amp;amp;q1=%22knitting+furiously%22 HathiTrust] and [https://link.gale.com/apps/doc/DX1902024403/NCUK?sid=bookmark-NCUK&amp;amp;xid=7a92dc49 Gale] &amp;lt;sub&amp;gt;([https://go.gale.com/ps/anonymous?id=GALE%7CDX1902024403 preview])&amp;lt;/sub&amp;gt;) of {{w|The Monthly Packet}}. Furthermore, Greene doing something furiously references &amp;quot;{{w|Colorless green ideas sleep furiously}}&amp;quot;, a correctly-formulated sentence that nonetheless conveys no meaning or logic.&lt;br /&gt;
* The {{w|Planck length}} (&amp;lt;big&amp;gt;ℓ&amp;lt;/big&amp;gt;&amp;lt;sub&amp;gt;P&amp;lt;/sub&amp;gt;) is the smallest theoretically measurable distance, defined by three fundamental constants in physics: the {{w|speed of light}} in a vacuum (c), {{w|Planck constant|Planck's constant}} (h), and the {{w|gravitational constant}} (G). The Planck length is vastly smaller than any known particle that isn't a point mass, and modern physics is a long way from investigating such a scale. The comic is 2,050 pixels tall, and Randall mentions the Planck length is roughly a further two thousand pixels past Brian Greene.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:Sizes Accurate on a vertical log scale&lt;br /&gt;
:[Series of images of characters doing various things. The things they are doing are listed in left to right order.]&lt;br /&gt;
:Cueball and Megan playing in a ball pen &lt;br /&gt;
:Megan using witchcraft to ban vista &amp;quot;Out, Vista!&amp;quot;&lt;br /&gt;
:Ponytail and Megan play Rock Band &lt;br /&gt;
:A couple is having sex under the cover in bed.&lt;br /&gt;
:[Below this series of images, an image of a man on the computer.]&lt;br /&gt;
:Cueball is on a computer and the image expands as it goes down. Here are the labels from left to right, up to down:&lt;br /&gt;
:CD &lt;br /&gt;
:DVD&lt;br /&gt;
:Case&lt;br /&gt;
:North Bridge&lt;br /&gt;
:PS/2&lt;br /&gt;
:Mouse (rodent)&lt;br /&gt;
:RAM&lt;br /&gt;
:CPU Socket Pin&lt;br /&gt;
:32,767 Angels Dancing (one more and they'd roll over and become {{w|Two's complement|32,768 Devils}}), Rice, Torrent (a bug), CPU, upcoming segfault&lt;br /&gt;
:dust mite&lt;br /&gt;
:hair&lt;br /&gt;
:OVUM&lt;br /&gt;
:Data (a pixel on Rick Astley's shoulder), rust mite, fork();&lt;br /&gt;
:Peter Norton fighting a bacteriophage&lt;br /&gt;
:memory&lt;br /&gt;
:carbon nanotubes&lt;br /&gt;
:space elevator&lt;br /&gt;
:a line of silicon (Si), Electron Cloud, a man made out of arrows saying &amp;quot;sup?&amp;quot;&lt;br /&gt;
:silicon nucleus&lt;br /&gt;
:IPod femto&lt;br /&gt;
:Brian Greene knitting furiously [next to his knitting needles there is text saying ''clink, clink'']&lt;br /&gt;
&lt;br /&gt;
==Trivia==&lt;br /&gt;
*The ballpit inside the apartment is a reference to [[150: Grownups]], in which Megan filled her apartment with playpen balls.&lt;br /&gt;
*The structure next to the couple in bed could be an elliptical dish to increase the sound from their [[Loud Sex]].&lt;br /&gt;
*[[1162: Log Scale]] and [[482: Height]] are other comics about the use of log scales.&lt;br /&gt;
*[[271: Powers of One]] mocks the concept of getting cool effects by zooming in/out by, instead of a log scale, using powers of one.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Large drawings]]&lt;br /&gt;
[[Category:Illustrations of scale]]&lt;br /&gt;
[[Category:Charts]]&lt;br /&gt;
[[Category:Physics]]&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Comics featuring Ponytail]]&lt;br /&gt;
[[Category:Comics featuring real people]]&lt;br /&gt;
[[Category:Rhythm Games]]&lt;br /&gt;
[[category:Sex]]&lt;/div&gt;</summary>
		<author><name>2601:300:4083:1C70:C442:2C72:39EC:66D6</name></author>	</entry>

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