/usr/share/applications/screensavers/surfaces.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=Surfaces
Exec=/usr/lib/xscreensaver/surfaces -root
TryExec=/usr/lib/xscreensaver/surfaces
Comment=This draws a visualization of several interesting parametric surfaces. http://mathworld.wolfram.com/DinisSurface.html http://en.wikipedia.org/wiki/Enneper_surface http://mathworld.wolfram.com/EnnepersMinimalSurface.html http://mathworld.wolfram.com/KuenSurface.html http://en.wikipedia.org/wiki/Moebius_strip http://mathworld.wolfram.com/Seashell.html http://mathworld.wolfram.com/SwallowtailCatastrophe.html http://mathworld.wolfram.com/BohemianDome.html http://en.wikipedia.org/wiki/Whitney_umbrella http://mathworld.wolfram.com/PlueckersConoid.html http://mathworld.wolfram.com/HennebergsMinimalSurface.html http://mathworld.wolfram.com/CatalansSurface.html http://mathworld.wolfram.com/CorkscrewSurface.html Written by Andrey Mirtchovski and Carsten Steger.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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