Illusions and Impossible Figures


	Illusions and Impossible Figures
rj3sp
2-19-2008 2:56 AM
361 views
rj3sp says:
In Wlfram MathWorld we find a nice survey of some optical illusions.
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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://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/d0188b98-b092-4210-ba3e-92affdc1ea4b/8C8B9DA6-12E0-45F4-8C1B-65CD86F1FF84/" 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://mathworld.wolfram.com/Illusion.html" href="http://mathworld.wolfram.com/Illusion.html" style="font-size: 11px;">mathworld.wolfram.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mathworld.wolfram.com/Illusion.html"><TABLE cellspacing="0" cellpadding="0" border="0"><TBODY><TR><TD valign="baseline" class="title"><SPAN class="nowrap">Illusion</SPAN></TD></TR><TR><TD valign="top"><SPAN class="nowrap"><IMG width="100%" height="3" alt="" src="http://mathworld.wolfram.com/images/entries/underline.gif" /><IMG width="20" height="3" alt="" src="http://mathworld.wolfram.com/images/entries/underline.gif" /></SPAN></TD><TD><IMG height="15" alt="" src="http://mathworld.wolfram.com/images/spacer.gif" /></TD></TR></TBODY></TABLE></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://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://content7.clipmarks.com/images/clip-icon.gif" 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://www.ritsumei.ac.jp/~akitaoka/saishin-e.html" href="http://www.ritsumei.ac.jp/~akitaoka/saishin-e.html" style="font-size: 11px;">www.ritsumei.ac.jp</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.ritsumei.ac.jp/~akitaoka/saishin-e.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.ritsumei.ac.jp/img/1EF51A89-E061-4479-84DA-C25B7AD431E9" alt="" /></div></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://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://content9.clipmarks.com/images/clip-icon.gif" 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://mathworld.wolfram.com/Illusion.html" href="http://mathworld.wolfram.com/Illusion.html" style="font-size: 11px;">mathworld.wolfram.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mathworld.wolfram.com/Illusion.html"><P class="CrossRefs">
<SPAN class="crosslinkheader">SEE ALSO:</SPAN> <A class="Hyperlink" href="http://mathworld.wolfram.com/BenhamsWheel.html">Benham's Wheel</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/BlackDotIllusion.html">Black Dot Illusion</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/BullseyeIllusion.html">Bullseye Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/CafeWallIllusion.html">Café Wall Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/FreemishCrate.html">Freemish
 Crate</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/GobletIllusion.html">Goblet Illusion</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/HermannGridIllusion.html">Hermann Grid Illusion</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/Hermann-HeringIllusion.html">Hermann-Hering Illusion</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/HyzersIllusion.html">Hyzer's Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/ImpossibleFigure.html">Impossible Figure</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/IrradiationIllusion.html">Irradiation
 Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/KanizsaTriangle.html">Kanizsa Triangle</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/Mueller-LyerIllusion.html">Müller-Lyer Illusion</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/NeckerCube.html">Necker Cube</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/OrbisonsIllusion.html">Orbison's Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/ParallelogramIllusion.html">Parallelogram
 Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/PenroseStairway.html">Penrose Stairway</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/PoggendorffIllusion.html">Poggendorff Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/PonzosIllusion.html">Ponzo's Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/Rabbit-DuckIllusion.html">Rabbit-Duck Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/Tribar.html">Tribar</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/Tribox.html">Tribox</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/Vertical-HorizontalIllusion.html">Vertical-Horizontal Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/YoungGirl-OldWomanIllusion.html">Young Girl-Old Woman Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/ZoellnersIllusion.html">Zöllner's Illusion</A>. <INPUT type="hidden" value="link:http://mathworld.wolfram.com/Illusion.html" name="query" /><A href="javascript:alert('This link contains javascript. Please visit the clip source to follow this link.');" target="_self">[Pages Linking Here]</A>
</P></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://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://content6.clipmarks.com/images/clip-icon.gif" 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://mathworld.wolfram.com/FreemishCrate.html" href="http://mathworld.wolfram.com/FreemishCrate.html" style="font-size: 11px;">mathworld.wolfram.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mathworld.wolfram.com/FreemishCrate.html"><SPAN class="nowrap">Freemish Crate</SPAN></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://mathworld.wolfram.com/FreemishCrate.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/mathworld.wolfram.com/img/F72E74C0-B6D7-4B22-B873-0DE7148F37A2" alt="FreemishCrate" /></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://mathworld.wolfram.com/FreemishCrate.html">
The Freemish crate, also called Escher's cube (Elber) or Hyzer's illusion (Pappas 1989, p. 13), is an <A class="Hyperlink" href="http://mathworld.wolfram.com/ImpossibleFigure.html">impossible
 figure</A> box that can be drawn but not built</blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://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://content8.clipmarks.com/images/clip-icon.gif" 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://mathworld.wolfram.com/ImpossibleFigure.html" href="http://mathworld.wolfram.com/ImpossibleFigure.html" style="font-size: 11px;">mathworld.wolfram.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://mathworld.wolfram.com/ImpossibleFigure.html"><P class="CrossRefs">
<SPAN class="crosslinkheader">SEE ALSO:</SPAN> <A class="Hyperlink" href="http://mathworld.wolfram.com/AmbihelicalHexnut.html">Ambihelical Hexnut</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/FreemishCrate.html">Freemish
 Crate</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/HomePlate.html">Home Plate</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/Illusion.html">Illusion</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/ImpossibleFork.html">Impossible
 Fork</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/ImpossibleJoinery.html">Impossible Joinery</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/ImpossibleTorus.html">Impossible Torus</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/KleinBottle.html">Klein Bottle</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/NeckerCube.html">Necker
 Cube</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/PenroseStairway.html">Penrose Stairway</A>,
 <A class="Hyperlink" href="http://mathworld.wolfram.com/PenroseTriangle.html">Penrose Triangle</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/Tribar.html">Tribar</A>, <A class="Hyperlink" href="http://mathworld.wolfram.com/Tribox.html">Tribox</A>.
 <INPUT type="hidden" value="link:http://mathworld.wolfram.com/ImpossibleFigure.html" name="query" /><A href="javascript:alert('This link contains javascript. Please visit the clip source to follow this link.');" target="_self">[Pages Linking Here]</A>
</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;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/8C8B9DA6-12E0-45F4-8C1B-65CD86F1FF84/blog/" title="blog or email this clip"><img src="http://content9.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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