/usr/share/xscreensaver/config/apollonian.xml is in xscreensaver-data-extra 5.15-2ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="apollonian" _label="Apollonian">
<command arg="-root"/>
<boolean id="label" _label="Draw labels" arg-unset="-no-label"/>
<boolean id="altgeom" _label="Include alternate geometries"
arg-unset="-no-altgeom"/>
<!-- don't know what -count does -->
<number id="cycles" type="slider" arg="-cycles %"
_label="Depth" _low-label="Shallow" _high-label="Deep"
low="1" high="20" default="20"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="2" high="255" default="64"/>
<number id="delay" type="slider" arg="-delay %"
_label="Speed" _low-label="Slow" _high-label="Fast"
low="0" high="1000000" default="1000000"
convert="invert"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
Draws an Apollonian gasket: a fractal packing of circles with
smaller circles, demonstrating Descartes's theorem.
http://en.wikipedia.org/wiki/Apollonian_gasket
http://en.wikipedia.org/wiki/Descartes%27_theorem
Written by Allan R. Wilks and David Bagley; 2002.
</_description>
</screensaver>
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