On the J'nanin Age, there are a variety of posts, each
with a sort of lens. You must find the source of light
(near the yellow post) and turn the cover until the
light is directed to the yellow post. From there, point
the light from post to post and ultimately to the receptor
next to one of the three tusks. The light posts can be
manipulated by clicking on the ring under the lens.
Record the order of the colors of the posts that the
light travels to in order to reach the receptor, this
order is the key to open the door.