Legacy of Time Easter Egg - Pictures on the Wall

The steam tunnels have a number of secret "cave paintings" on the walls. You have to hold down "E"
while moving the door and looking at the wall.

Three Spheres, door to the right, right wall, gold etching from the Pioneer 10/11 deep space probes

Crossed Swords, door to the left, right wall, phrase "DENY EVERYTHING"

Linked Circles, door to the left, right wall, same message

Leafless Tree, door to the left, right wall, a bizzare praying mantis-like monster


source : http://incolor.inetnebr.com/mbeerman/jmp3walk.html#misc