Da Vinci Code objects

There are actual Easter eggs in multiplayer desert of Sandtrap. They are located near each of the pillar near the top. The eggs themselves are textured using a UV Mapping Reference texture (used to help artists paint textures on objects).

It may be a forgotten programming by Bungie Staff. For a closer look, you'll need to overload the boundaries using Trip Mines which will allow you to go through, but the Eggs are high up. You will need to go into theater mode and speed up to the part where you overloaded the boundaries. With the boundaries no longer in place you will be able to push a free camera through and go upwards to see the Eggs. It is also possible to look at the UNSC Aegis Fate using this method, and you can only get into the partially built hangar.

These eggs have been confirmed to be the guardians on Sandtrap. Whenever a player enters the mine field, these eggs, located at the watchtowers, will fire a faint sentinel beam into the minefield which supposedly triggers the mines that kill you. These beams are supposed to be harmless to the player. A similar system appears on the map Sandbox. The only difference is that the beams are actually meant to kill you and the beams on Sandbox are also much easier to see than the ones on Sandtrap.

It has been confirmed that the exact same Easter Eggs appear on Sandbox and are also responsible for firing the beams.