/usr/share/xscreensaver/config/hilbert.xml is in xscreensaver-gl-extra 5.30-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<screensaver name="hilbert" _label="Hilbert" gl="yes">
<command arg="-root"/>
<hgroup>
<vgroup>
<hgroup>
<select id="twodee">
<option id="random" _label="2D or 3D"/>
<option id="2D" _label="2D" arg-set="-mode 2d"/>
<option id="3D" _label="3D" arg-set="-mode 3d"/>
</select>
<select id="closed">
<option id="random" _label="Open or closed paths"/>
<option id="closed" _label="Closed" arg-set="-ends closed"/>
<option id="open" _label="Open" arg-set="-ends open"/>
</select>
</hgroup>
<hgroup>
<vgroup>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Slow" _high-label="Fast"
low="0" high="100000" default="30000"
convert="invert"/>
<number id="speed" type="slider" arg="-speed %"
_label="Speed" _low-label="Slow" _high-label="Fast"
low="0.02" high="10.0" default="1.0"/>
</vgroup>
<vgroup>
<number id="depth" type="slider" arg="-max-depth %"
_label="Recursion levels" _low-label="2" _high-label="10"
low="2" high="10" default="5"/>
<number id="thickness" type="slider" arg="-thickness %"
_label="Line thickness" _low-label="Thin" _high-label="Thick"
low="0.01" high="1.0" default="0.25"/>
</vgroup>
</hgroup>
<hgroup>
<boolean id="wander" _label="Wander" arg-set="-wander"/>
<boolean id="spin" _label="Spin" arg-unset="-no-spin"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<boolean id="wire" _label="Wireframe" arg-set="-wireframe"/>
</hgroup>
</vgroup>
</hgroup>
<xscreensaver-updater />
<_description>
The recursive Hilbert space-filling curve, both 2D and 3D variants.
It incrementally animates the growth and recursion to the maximum
depth, then unwinds it back.
The Hilbert path is a single contiguous line that can fill a volume
without crossing itself. As a data structure, Hilbert paths are
useful because ordering along the curve preserves locality: points
that are close together along the curve are also close together in space.
The converse is often, but not always, true. The coloration
reflects this.
http://en.wikipedia.org/wiki/Hilbert_curve
Written by Jamie Zawinski; 2011.
</_description>
</screensaver>
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