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	<id>https://katlas.org/index.php?action=history&amp;feed=atom&amp;title=File%3AHopf-illusion.png</id>
	<title>File:Hopf-illusion.png - Revision history</title>
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	<updated>2026-06-25T10:52:30Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://katlas.org/index.php?title=File:Hopf-illusion.png&amp;diff=1712828&amp;oldid=prev</id>
		<title>AnonMoos at 21:20, 5 October 2011</title>
		<link rel="alternate" type="text/html" href="https://katlas.org/index.php?title=File:Hopf-illusion.png&amp;diff=1712828&amp;oldid=prev"/>
		<updated>2011-10-05T21:20:39Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 17:20, 5 October 2011&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;
  &lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;
  &lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
  &lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;
  &lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Hopf link of mathematical knot theory, depicted as an impossible object, shown in isometric projection pseudo-perspective.&lt;/div&gt;&lt;/td&gt;
  &lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;
  &lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Hopf link of mathematical knot theory, depicted as an impossible object, shown in isometric projection pseudo-perspective.&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;  (See also [[:Image:Heterosexual-symbol-3D.png]].)&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;
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  &lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;
  &lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Self-made, declared to be in public domain, generated from the following PostScript source code: &lt;/div&gt;&lt;/td&gt;
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		<author><name>AnonMoos</name></author>
	</entry>
	<entry>
		<id>https://katlas.org/index.php?title=File:Hopf-illusion.png&amp;diff=1712779&amp;oldid=prev</id>
		<title>AnonMoos: Hopf link of mathematical knot theory, depicted as an impossible object, shown in isometric projection pseudo-perspective.

Self-made, declared to be in public domain, generated from the following PostScript source code: 
&lt;pre&gt;%!
300 335 translate .6 dup </title>
		<link rel="alternate" type="text/html" href="https://katlas.org/index.php?title=File:Hopf-illusion.png&amp;diff=1712779&amp;oldid=prev"/>
		<updated>2011-06-05T02:06:34Z</updated>

		<summary type="html">&lt;p&gt;Hopf link of mathematical knot theory, depicted as an impossible object, shown in isometric projection pseudo-perspective.  Self-made, declared to be in public domain, generated from the following PostScript source code:  &amp;lt;pre&amp;gt;%! 300 335 translate .6 dup &lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;Hopf link of mathematical knot theory, depicted as an impossible object, shown in isometric projection pseudo-perspective.&lt;br /&gt;
&lt;br /&gt;
Self-made, declared to be in public domain, generated from the following PostScript source code: &lt;br /&gt;
&amp;lt;pre&amp;gt;%!&lt;br /&gt;
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15552 sqrt mul exch}def/l{X lineto}def 9 setlinewidth&lt;br /&gt;
1 setlinejoin&lt;br /&gt;
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%EOF&amp;lt;/pre&amp;gt;&lt;/div&gt;</summary>
		<author><name>AnonMoos</name></author>
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