The Gift

The Gift is currently an elusive concept in the game's lore, mentioned in the descriptions of the eye modules and by M-50. It seems those who accepted the gift (which may or may not have been a willing process) have red eyes, and are called Devout. It seems the Gift may grant certain abilities that machine-lifeforms would not otherwise be able to posses for their design, such as M-50's ability to scan S-105 (Sen). Those who were 'saved' from the gift are labeled 'Embraced' and have green eyes. Those who take neither side are Drifters, and have yellow eyes. Blue eyes are apparently a sign of the days before The Gift was an option.

It is unclear if the Babel Replica tower or the chapel like room in the Lector's Library, and the painting there in, have anything to do with The Gift or not.

Mechanical Effects

Eye modules can be bought from traders and the Lens Maker. They change the color pallet of the game.

Having no eye module installed causes the game to become heavily pixelated, and uses the Drifter pallet.

The original steam demo did not include this feature. Sen's eye was green (as it still is by default), and the color pallet in that version was either somewhere between the Embraced and Drifter pallets, or just the Drifter pallet. For example, the lifts had yellow accents, where as with the April 23rd update, they only have yellow accents with the Drifter eyes.