Jamie Luray describes the speaker as a book, and the comparison runs through the whole poem. A book looks calm and still on a shelf, but inside it can be full of adventure and imagination. The speaker seems to feel the same way: quiet on the outside, lively and curious underneath.
The line "Words in black, / With white ones in between" is a clever detail. It describes the look of a printed page, but it also suggests that what the speaker shows is only part of the story, and that the blank spaces hold things left unsaid. That fits the "mysterious and secretive" feeling of the poem. The ending is an invitation: "Open to find / The secrets I hide." The speaker wants to be read, but only by someone patient enough to take the time. The mood is gentle, reflective, and a little shy, with a quiet hope of being understood.