Halo 3 Easter Egg - It Glows

Go to Foundry on Forge. Go to the base on the left (if you had your back to the farthest wall next to the truck) and turn into a monitor. Enter a door and turn left. Create a machine gun turret and push it as far into the metal fenced wall as possible (make sure the barrel faces outward). turn into a player and get on the turret, you might have to jump on the turret to get on. once on the turret look all the way up and turn into a monitor, now you are inside the fenced wall. go left until you see a little computer in the wall with green dots in it. look right and you will see a sign with a soccer ball the words IT GLOWS underneath