/usr/share/applications/screensavers/spheremonics.desktop is in xscreensaver-gl 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Spheremonics
Exec=/usr/lib/xscreensaver/spheremonics -root
TryExec=/usr/lib/xscreensaver/spheremonics
Comment=These closed objects are commonly called spherical harmonics, although they are only remotely related to the mathematical definition found in the solution to certain wave functions, most notably the eigenfunctions of angular momentum operators. http://en.wikipedia.org/wiki/Spherical_harmonics#Visualization_of_the_spherical_harmonics Written by Paul Bourke and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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