/usr/share/xscreensaver/config/menger.xml is in xscreensaver-gl-extra 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="menger" _label="Menger" gl="yes">
<command arg="-root"/>
<video href="http://www.youtube.com/watch?v=qpnuNJH9cLw"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="30000"
convert="invert"/>
<number id="descent" type="slider" arg="-speed %"
_label="Duration" _low-label="Short" _high-label="Long"
low="2" high="500" default="150"
convert="invert"/>
<number id="depth" type="spinbutton" arg="-depth %"
_label="Max depth" low="1" high="6" default="3"/>
<!-- #### -no-optimize -->
<boolean id="wander" _label="Wander" arg-unset="-no-wander"/>
<select id="rotation">
<option id="no" _label="Don't rotate" arg-set="-spin 0"/>
<option id="x" _label="Rotate around X axis" arg-set="-spin X"/>
<option id="y" _label="Rotate around Y axis" arg-set="-spin Y"/>
<option id="z" _label="Rotate around Z axis" arg-set="-spin Z"/>
<option id="xy" _label="Rotate around X and Y axes" arg-set="-spin XY"/>
<option id="xz" _label="Rotate around X and Z axes" arg-set="-spin XZ"/>
<option id="yz" _label="Rotate around Y and Z axes" arg-set="-spin YZ"/>
<option id="xyz" _label="Rotate around all three axes"/>
</select>
<boolean id="wire" _label="Wireframe" arg-set="-wireframe"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
<_description>
The Menger Gasket is a cube-based recursive fractal object
analagous to the Sierpinski Tetrahedron.
https://en.wikipedia.org/wiki/Menger_sponge
https://en.wikipedia.org/wiki/Sierpinski_carpet
Written by Jamie Zawinski; 2001.
</_description>
</screensaver>
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