Chroma's environment, the mysterious "mnemonos," is an explicit metaphor for the Internet or cyberspace, but even when armed with a metaphorical description, the reader must perform Erik Loyer's text in order to do anything but name it.

From Chroma Chapter 0:

Eons ago, all human beings had the ability to enter 'mnemonos,'
a 'natural cyberspace' where the things of the mind appear
as real as anything your five senses perceive.

This realm is filled with a substance called 'marrow,'
which transmits information just as air transmits sound.

The reader mimics the act of entering the mnemonos in each chapter, reading and moving through "cyberspace" in a fluid, visual-sensory communication rather than a verbal-textual one. The reader is given names for the things she/he encounters -- "mnemonos," "marrow," and later "avatars" -- but these names are just placeholders for the reader's interpretation of the text. Like Orion says in Chapter 5:

Now, Perry, Duck and I, we know each other, or do we?
When I say the word "green," what color do you think of?
And what are the chances that it's the exact same shade
of green that I'm thinking of
And if our language for describing color is that imprecise,
how much more imprecise must it be when describing human beings?

Most of the text is indeterminate, or, alternatively, abstract, because (as it self-reflexively says) language is fundamentally incapable of being anything more than signification. Every reading shows the same shade of green, but the play of colors and shapes on the screen is different in each reading. Each performer/reader of the text can represent a new idea because the animation is, for the most part, iconography. So, when Dr. Anders says the phrase "natural cyberspace," it only has meaning through visual metaphor. There is no standard code that the mnemonos is written in, only what the reader sees in it.