Comment by ButlerianJihad

https://hitchhikers.fandom.com/wiki/Spacecraft#Haggunenon_Ad...

  Marvin was able to touch the surface of the ship and open up an entry hatchway, and the interior of the ship was completely black. There were black controls labelled in black, on a black background, with a little light that lit up black, which made it difficult to control the ship. The ceiling and walls of the swaying cabin were also black, as well as the seats, control panel, the instruments and the little screws that held them in place. The thin tufted nylon floor covering was black, and when a corner of the foam underlay was lifted up that was also discovered to be was black.