In addition to the fact that the title of the series in the screensaver is written in white letters on a black background (in the final of the fifth season, it is written in black on white), the combinations and contrasts of these 2 colors constantly surround the characters.

In the second part of the pilot episode, John Locke explains to Walt Lloyd how to play backgammon, outlining that there are 2 players, 2 sides — one is light and the other one is dark.

In the sixth episode of the first season, Jack finds a leather pouch with black and white stones. Their meaning is revealed in the sixth season: Jacob and the Man in Black used them to play a game.