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How an invisibility cloak works
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6-25-2008 6:10 AM
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/3c6ead2d-9139-4a6a-9cb6-2f48b196c813/45E72249-0C10-448B-82FF-C8B75AE2EA01/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://science.howstuffworks.com/invisibility-cloak.htm" href="http://science.howstuffworks.com/invisibility-cloak.htm" style="font-size: 11px;">science.howstuffworks.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm"><DIV><DIV class="head"><DIV class="pageList"><H3>Inside this Article</H3> <OL type="1" class="column"> <li style="margin-left:16px;padding-left: 0px;"><A class="on" href="http://science.howstuffworks.com/invisibility-cloak.htm">Introduction to How Invisibility Cloaks Work</A></LI> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/invisibility-cloak1.htm">Altered Reality</A></LI> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/invisibility-cloak2.htm">More Invisibility Cloak Components</A></LI> </OL> <OL type="1" start="4" class="column"> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/invisibility-cloak3.htm">The Complete System</A></LI> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/invisibility-cloak4.htm">Head-mounted Displays</A></LI> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/invisibility-cloak5.htm">Real-World Applications</A></LI> <LI class="more"><DIV class="moreBox"><A>See more »</A> <OL type="1" start="7" class="morePop plain"> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/invisibility-cloak6.htm">Lots More Information</A></LI> <li style="margin-left:16px;padding-left: 0px;"><A href="http://science.howstuffworks.com/optics-channel.htm">See all Optics articles</A></LI> </OL></DIV></LI> </OL><DIV class="clearer"></DIV> </DIV> </DIV> <DIV class="lineRight"> <DIV class="relatedVideoBox"> <DIV class="item"> <DIV class="title">Science Videos</DIV> <CENTER> <DIV class="thumbnailBox"> <A href="http://videos.howstuffworks.com/science"><IMG border="0" title="Science Videos" alt="Science Videos" src="http://static.howstuffworks.com/en-us/science/buttons/play-video.jpg" /></A> </DIV> </CENTER> <UL class="plain"> <li style="margin-left:16px;padding-left: 0px;"><A href="http://videos.howstuffworks.com/science">More Science Videos »</A></LI> </UL> </DIV> </DIV> </DIV> </DIV> </blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/science.howstuffworks.com/img/B8B6DB25-0FD6-4A68-A8CD-FFC1068DD578" alt="a optical-camouflage demonstration" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm"><STRONG>Optical-camouflage technology developed at the University of Tokyo</STRONG></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm">The garment is made of a special material that we'll examine more closely in a moment</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm">Next, an observer (Person B) stands before Person A at a specific location. At that location, instead of seeing Person A wearing a hooded raincoat, Person B sees right through the cloak, making Person A appear to be invisible.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm">The photograph on the right below shows you what Person B would see. If Person B were viewing from a slightly different location, he would simply see Person A wearing a silver garment (left photograph below</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/science.howstuffworks.com/img/DE328055-A44A-42FF-BC75-1147BCF15FAF" alt="an invisibility cloak before and during use" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.howstuffworks.com/invisibility-cloak.htm"><P> Still, despite its limitations, this is a cool piece of technology. Not only that, but it's also a technology that's been around for a while. </P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/45E72249-0C10-448B-82FF-C8B75AE2EA01/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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