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	<title>Optical Illusions &#187; Impossible worlds (inc. staircases)</title>
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	<description>Illusions and visual special effects - explanations and tutorials</description>
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		<title>The Twisted Stairs (version 2)</title>
		<link>http://www.opticalillusion.net/optical-illusions/the-twisted-stairs-version-2/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/the-twisted-stairs-version-2/#comments</comments>
		<pubDate>Fri, 15 Jan 2010 15:28:39 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Geometric illusions]]></category>
		<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=1780</guid>
		<description><![CDATA[
I&#8217;ve been wanting to do a new version of my earlier post of The Twisted Stairs.  That&#8217;s partly because the way I placed the figures in the original posting, they got in a bit the way of seeing the twist in the lateral flights of stairs. I reckon you can see the twist effect better [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>80 Illusions Poster</title>
		<link>http://www.opticalillusion.net/optical-illusions/80-illusions-poster/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/80-illusions-poster/#comments</comments>
		<pubDate>Wed, 09 Dec 2009 17:06:20 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Ambiguous images]]></category>
		<category><![CDATA[Geometric illusions]]></category>
		<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>
		<category><![CDATA[illusions and aesthetics]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=1720</guid>
		<description><![CDATA[
You&#8217;re welcome to download and use for private purposes any of the imagery on the site, except for a very few pictures where I indicate that third party copyright might apply. But if you&#8217;d like a giant, 35 x 23 inch poster, full of illusions, you can buy it (along with loads of illusions on [...]]]></description>
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		<slash:comments>2</slash:comments>
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		<title>Bad Day in the Art Museum</title>
		<link>http://www.opticalillusion.net/impossible-worlds/bad-day-in-the-art-museum/</link>
		<comments>http://www.opticalillusion.net/impossible-worlds/bad-day-in-the-art-museum/#comments</comments>
		<pubDate>Sat, 28 Mar 2009 09:15:24 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=803</guid>
		<description><![CDATA[



Interesting things can happen when you have pictures within pictures. Not so much, for example, with an everyday photo of an art gallery, if all the pictures are behaving well and staying in their frames. But sometimes it&#8217;s not possible to tell when the picture of a picture ends, and the picture of the real [...]]]></description>
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		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Scrambled space</title>
		<link>http://www.opticalillusion.net/optical-illusions/scrambled-space/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/scrambled-space/#comments</comments>
		<pubDate>Fri, 06 Mar 2009 11:41:05 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=773</guid>
		<description><![CDATA[
One of surrealist painter Rene Magritte&#8217;s cleverest paintings, Carte Blanche, is of a rider in a wood, but all mixed up with the trees. I had a shot at playing with the same effects in the earlier Halloween post.  This time, I&#8217;ve tweaked up the complication with an impossible figure/ground reversal half-way up the columns, [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>The twisted castle</title>
		<link>http://www.opticalillusion.net/optical-illusions/the-inverted-castle/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/the-inverted-castle/#comments</comments>
		<pubDate>Sat, 17 Jan 2009 15:03:47 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=577</guid>
		<description><![CDATA[

This is another transformation based on one in my illusion cartoon story.  I did it to see whether I could devise an adventure, set in graphic world, with transformations that are forbidden in our everyday world as the events that take the story forward.  Most of the transformations, like this one, offer an escape route [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Convex/concave spacewarp</title>
		<link>http://www.opticalillusion.net/optical-illusions/convexconcave-spacewarp/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/convexconcave-spacewarp/#comments</comments>
		<pubDate>Sat, 08 Nov 2008 15:32:56 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=376</guid>
		<description><![CDATA[This is about the simplest of all spatial transformations.  In the top picture, the mice are at risk from the cats.  In the bottom picture, the stairs have vanished, and as the eye travels along the picture from the left, a concave terrace turns into a convex, step shape.  There&#8217;s now a protective inside/out space-warp [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Outlines, objects and apertures</title>
		<link>http://www.opticalillusion.net/optical-illusions/outlines-objects-and-apertures/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/outlines-objects-and-apertures/#comments</comments>
		<pubDate>Mon, 03 Nov 2008 12:14:02 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Ambiguous images]]></category>
		<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=412</guid>
		<description><![CDATA[ 
This stag may look OK at first glance (well, you know, sort of&#8230;), but hang on, has he got three antlers, as at the top of the picture, or only two, as down by his ears?  Following on from the last post, it&#8217;s another example of what happens when apertures or gaps in the visual [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Halloween magic</title>
		<link>http://www.opticalillusion.net/optical-illusions/halloween-magic/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/halloween-magic/#comments</comments>
		<pubDate>Fri, 31 Oct 2008 09:02:23 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=406</guid>
		<description><![CDATA[Here&#8217;s a scene for Halloween.  In our everyday view of the world, the orderly way in which one thing blocks our view of another is something we can depend on to orientate ourselves in the world around us.  These witches are breaking the rules.  The lower ones appear and disappear at puzzling locations, and the [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>A New(?) Ever Receding Staircase</title>
		<link>http://www.opticalillusion.net/optical-illusions/a-new-ever-receding-staircase/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/a-new-ever-receding-staircase/#comments</comments>
		<pubDate>Thu, 23 Oct 2008 17:09:18 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>
		<category><![CDATA[POSTS WITH ANIMATIONS]]></category>

		<guid isPermaLink="false">http://localhost/o/?p=86</guid>
		<description><![CDATA[More on staircases. Here&#8217;s a picture of penguins on a stripped down version of a never-ending staircase, like the one in M.C.Escher&#8217;s famous print Ascending Descending.  (Or just put the name Escher and that title into Google images to get stacks of versions). In my version, it&#8217;s penguins who will go on climbing the [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Twisted stairs</title>
		<link>http://www.opticalillusion.net/optical-illusions/twisted-stairs/</link>
		<comments>http://www.opticalillusion.net/optical-illusions/twisted-stairs/#comments</comments>
		<pubDate>Sat, 18 Oct 2008 15:47:40 +0000</pubDate>
		<dc:creator>david</dc:creator>
				<category><![CDATA[Impossible worlds (inc. staircases)]]></category>
		<category><![CDATA[Optical Illusions]]></category>

		<guid isPermaLink="false">http://www.opticalillusion.net/?p=363</guid>
		<description><![CDATA[
 
Here are some crazy stairs.  Look at the stairs leading up to the balcony, and at the foot of the stairs you&#8217;re looking down on them from above, whilst up by the balcony you&#8217;re looking up at them from below. Nothing wrong with that, in a perspective view, but these steps are in a parallel [...]]]></description>
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