/usr/share/applications/screensavers/hilbert.desktop is in xscreensaver-gl-extra 5.36-1.
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 | [Desktop Entry]
Name=Hilbert
Exec=/usr/lib/xscreensaver/hilbert -root
TryExec=/usr/lib/xscreensaver/hilbert
Comment=This draws the recursive Hilbert space-filling curve, in 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 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.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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