The Fire Marble Domes
Recall the domes found atop the buildings on all five islands in Riven. You should notice here that one of the symbols etched on the surface of each dome is colored yellow. To stop the domes, you must use the kinetoscopes always found near these domes (except the one on Crater Island; the kinetoscope is on the other side of a wall). You don't have to stop every one of these domes from spinning (in fact, the kinetoscope on Plateau Island has a broken viewer), since the linking books contained inside each one go to the same place - Gehn's Residence - but you will need the one yellow symbol on each one, as they differ.
If you watch the dome carefully as it spins, you should be able to pick up the symbol. Otherwise, to stop it, you must look through the kinetoscope and click the button on the top of it when the yellow symbol appears through the viewer. For the broken kinetoscope on Plateau Island, just keep clicking the button until you get it to stop. In fact, you can use this method on any of the domes.
Once you stop a dome from spinning, it will open, revealing a book through the hazy glass. You must first power up these domes by solving the Marble Puzzle (which you might not do until later in the game) to open the dome.
 |  | | You need to enter the five D'ni numbers from the journal in Gehn's Laboratory to get to the linking book. For example, this one is set up for 6, 11, 15, 17, 19, from largest to smallest, right to left. |
There is also a slide bar. The way to open the domes is to use the five D'ni numbers you find in Gehn's journal in his lab. The slide bar is gradated in fives up to 25 marks. Enter the highest D'ni number first by moving the first slider to the mark corresponding to its number. Move each one accordingly, down to the smallest D'ni number last. Then click the button and the dome will spin open as you find yourself inside, in front of a linking book to Gehn's Residence, as well as a button on the floor to the right of the stand that you can press to be let out again.
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