/usr/share/applications/screensavers/romanboy.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.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=RomanBoy
Exec=/usr/lib/xscreensaver/romanboy -root
TryExec=/usr/lib/xscreensaver/romanboy
Comment=A 3D immersion of the real projective plane that smoothly deforms between the Roman surface and the Boy surface. You can walk on the surface of the real projective plane or rotate it in 3D. Furthermore, it is possible to smoothly deform the real projective plane between the Roman surface and the Boy surface while turning it or walking on it. Inspired by François Apéry's book "Models of the Real Projective Plane", Vieweg, 1987. https://en.wikipedia.org/wiki/Boy%27s_surface https://en.wikipedia.org/wiki/Roman_surface http://mathworld.wolfram.com/BoySurface.html http://mathworld.wolfram.com/RomanSurface.html Written by Carsten Steger.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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