This is the artwork of deviantART user "CC3705",
Alexandre Chateauneuf.

It was downloaded from 
<http://cc3705.deviantart.com/art/Parabola-Artwork-198743066>.

The wallpaper that was uploaded separately at
<http://cc3705.deviantart.com/art/Parabola-desktop-wallpaper-198744471>
is already included.

As detailed by the `readme` file in the archive, the artwork is
CC BY-SA-2.5-CA, and the fonts used are Open Font License.