Have you tried turning them and looking into them?
Which do you think would be more useful, looking at a stone, the ocean, a blackish green blob, or another viewer?
Line up the viewers so that they are all pointing at each other. They will form a path between the light source and the prism near the Voltaic tusk.
I've done all this and nothing happened. Now what?
Okay, I did it! The light is traveling through the viewers. What should I do now?
The prism is lit. What do I do with the colors on the buttons?