Some ideas:
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Lining Books vs descriptive books
I believe the only Descriptive Books we see that are explicitly labeled as such are the Riven book, and the Rahleeshan book. So maybe show side-by-side pictures of one of those with a regular linking book would work, as the sheer size difference should be evident.
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Charastics of the D'ni as a race
There's a photo of Aitrus (Gehn's father) in Riven. That might help.
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Number system
There are a bunch of appearances of this, in Riven especially. Gehn's clock has the numbers on it. Or the D'ni clock in Uru.