I know I'm caught up in a trivial detail, but everything else in Riven: The Sequel to Myst is wrapped up so neatly. A lot of what's encountered is tangentially explained in characters' journals. The "puzzles" feel like they've sprung naturally from the world rather than being some arbitrary obstacle in a video game. The result (IMO) is a rich, immersive and impressively woven narrative.

For instance Gehn's laboratory journal explains the significance of the nearby frog-catching device, . However, from the same lab journal (entry 83.5.14) he writes

I have been cataloging the “natural” elements of this Age for nearly thirty years now, yet still I continue to find evidence of the D’ni’s preoccupation with Five. As a boy, it was very clear to me that the number five had a special significance to the D’ni society — from the ancient heraldic emblems of the ruling elite to the humble homes of the commoners, it was ubiquitous. Its presence here is obviously a direct reflection of the minds that designed the texts that I used to compose this Age. [...]

While most of my constructions have been based on D’ni designs, I see now that the ones that I have imbued with the power of Five are clearly the most beautiful, the most perfect. And, I believe, the most structurally sound.

I am still attempting to determine how the D’ni color symbology reflects this superior design principle. Although superficially it is based on a six color system, I am convinced that there has to be a deeper connection to Five. I will continue to investigate.

On Riven, the number system and the letter system are based on the "power of Five", so the six-symbol colour system really stands out. Here it is by the way:

Riven's six-symbol colour system

These symbols appear on the five spinning domes--presumably constructed by Gehn--that contain linking books to his age. However there is five "transitional" symbols connecting each pair of the original six, resulting in 6x6=36 total symbols on each dome.

The symbols on each spinning dome, with corresponding colour

So unlike everything else, the colours are based on a system of six, and Gehn seems to be going along with it despite his preoccupation with the "power of Five". It wouldn't be so hard to have a five-colour system--just remove orange. In fact Newton's famous ROYGBIV spectrum was originally five colours (RYGBV) before he added orange and indigo to obtain symmetry with seven-note musical scales (octaves). It just seems to simple to be overlooked by the developers, who went to the trouble of making up their own language etc.

For me the worst part is the marbles puzzle. Each of the five spinning domes is associated with a colour, and you can determine four of them through the nearby viewfinders. However the fifth is inaccessible until after you solve the puzzle (to the best of my knowledge) so you end up having to guess the final colour (granted, from only two choices). Maybe it's not a big deal, but you can solve every other puzzle in the game with zero guessing, so to me it sticks out like a sore thumb.

To summarise, my questions are:

  1. Is there in fact a way to determine the fifth colour without guessing?
  2. Is there a significance to the sixth, unused colour?
  3. Why are the colours based on a system of six instead of five?
  4. Is there even a strong link between D'ni and the power of Five, or is Gehn seeing patterns where none exist? (In reference to the journal excerpt above.)
  • 1
    It is true that the D'ni use base 5 math. As to the marble puzzle, the solution lies in the colour of the grand dome.
    – MBraedley
    Commented Feb 2, 2014 at 14:15
  • 1
    @MBraedley You mean the sixth colour is left out because it's the colour of the main dome? Possible...
    – Verge
    Commented Feb 7, 2014 at 7:03
  • 1
    My brothers had the walk-through book (don't use it, it's a hollow victory), and I seem to remember 2 diagrams, one containing the grand dome, the other without it.
    – MBraedley
    Commented Feb 7, 2014 at 12:35
  • 1
    This is just speculation, but to me, it seems like you've answered your own question by linking to the FAQ. > As Richard A. Watson put it, "Five is special to D'ni in the many of the same ways that 10 is special to us. Gehn just blew it way out of proportion, trying to connect everything around him to five." Added to this, don't forget that it was actually Gehn who made these constructions in the first place. He might have been used to the color system he's known his whole life, never thinking about the fact that he could reduce that number.
    – DaVince
    Commented Oct 10, 2017 at 17:27


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