1 <?xml version="1.0" encoding="ISO-8859-1"?>
3 <screensaver name="penrose" _label="Penrose">
7 <video href="https://www.youtube.com/watch?v=atlkrWkbYHk"/>
11 <number id="delay" type="slider" arg="-delay %"
12 _label="Frame rate" _low-label="Low" _high-label="High"
13 low="0" high="100000" default="10000"
16 <number id="ncolors" type="slider" arg="-ncolors %"
17 _label="Number of colors" _low-label="Two" _high-label="Many"
18 low="1" high="255" default="64"/>
21 <number id="size" type="slider" arg="-size %"
22 _label="Tile size" _low-label="Small" _high-label="Large"
23 low="1" high="100" default="40"/>
25 <boolean id="ammann" _label="Draw ammann lines" arg-set="-ammann"/>
26 <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
31 <xscreensaver-updater />
34 Quasiperiodic tilings.
36 In April 1997, Sir Roger Penrose, a British math professor who has
37 worked with Stephen Hawking on such topics as relativity, black
38 holes, and whether time has a beginning, filed a
39 copyright-infringement lawsuit against the Kimberly-Clark
40 Corporation, which Penrose said copied a pattern he created (a
41 pattern demonstrating that "a nonrepeating pattern could exist in
42 nature") for its Kleenex quilted toilet paper. Penrose said he
43 doesn't like litigation but, "When it comes to the population of
44 Great Britain being invited by a multinational to wipe their bottoms
45 on what appears to be the work of a Knight of the Realm, then a last
48 As reported by News of the Weird #491, 4-Jul-1997.
50 https://en.wikipedia.org/wiki/Penrose_tiling
51 https://en.wikipedia.org/wiki/Tessellation
53 Written by Timo Korvola; 1997.