On the J'nanin Age, there are a variety of posts, each with a sort of lens. You have to 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. You can manipulate the light posts 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.
-You must turn the light on that is beside the yellow post, then make the light follow a certain sequence of the posts to reach a receptor. The sequence is yellow, blue, green, red, yellow, fuschia, and red. You must make the light follow those posts through the receptor to a door. Then, click the bolts on the door in the correct order. It is the same order as the posts.