Sidebars, boxes and pull quotes
A nonfiction page is rarely one plain stream of text. It carries devices: a boxed case study, a shaded warning, a line of your own prose lifted out and enlarged. Each is an interruption the reader agreed to in advance. Used with judgment they make a dense page approachable. Used freely they turn it into a brochure.
The two you will reach for most are the sidebar and the pull quote. Authors treat them as one tool, and they are opposites, governed by opposite rules.
What each one is for
A sidebar or a box holds material that supports the argument but interrupts it. A case study, a worked example, a warning about a step people get wrong, the definition of a term you are about to use forty times. It sits apart because reading it in sequence would break the sentence the reader is in the middle of. In a book it is usually a box in the measure, or a block indented from both margins.
A pull quote is a line lifted from the surrounding text and set larger. It adds nothing to the page. That is not a fault, it is the job. A pull quote gives the eye somewhere to land on a wall of type, and it sells the page to someone flipping through the book in a shop or scrolling the free sample.
The rule authors get backwards
A pull quote repeats text that is already there, so it must never introduce new information. A reader who skips every pull quote in your book must lose nothing, because most readers will skip every one. The moment a pull quote carries a fact that appears nowhere else, you have hidden a fact inside the decoration.
A sidebar is the mirror image. Its content appears nowhere else, so it must never be skippable if the reader needs it. If your argument depends on the worked example in the box, that example is not a sidebar — it is a paragraph you have pushed out of the way, and it belongs back in the text.
The test takes two minutes. Read a chapter ignoring every device: it should make complete sense. Then read only the devices. If the first pass fails, a box is load-bearing. If the second surprises you, a pull quote is smuggling content.
In the Interior Formatter. It reads your .docx for structure only — chapter starts, italics, bold, scene breaks — and sets the interior in black ink, so a device that depends on color is a device to rethink before you place it. Anything you bring in as an image is checked against the size it will actually print. Start your interior → · about the Interior Formatter
Let the box break
Boxes come in two kinds, and which you choose decides how your pages fall.
A box that can break carries on across a page turn: rule closed at the foot, reopened at the top of the next page. It is far more robust, because the page composes normally around it.
A box that must stay whole constrains pagination. When it will not fit in the space left, it moves entire to the next page and leaves that space behind as white. One of those is invisible. Twenty gives you twenty short pages, and short pages read as mistakes rather than as design.
So: let long boxes break, and reserve keep-together for short ones, where the gap they can leave is small enough not to show. And never let a box open in the last two or three lines of a page — an opened rule with a single line under it looks like a printing fault.
Tints and rules print differently from how they look
A tint behind text is the first thing most authors try and the thing that costs the most. On a backlit screen, light gray behind black text looks crisp. On paper it is a contrast reduction, and contrast is what makes text readable at all — see Legibility, and the readers you are leaving out.
Worse, in a black-and-white interior a tint is not a color at all. It is a pattern of black dots, and a light one can look mottled at print-on-demand resolution, or come back from two printers as two different shades. The trap has no bottom: lighten the tint to protect the contrast and it stops distinguishing the box; darken it to mark the box and the text gets harder to read.
Distinguish with space instead. A block indented from both margins, with a hairline rule above and below, is unmistakable and costs nothing in readability. Reversed type — white out of black — is worse still: ink spread closes up the letterforms at small sizes. If you want color, price it first: Color inside the book, and what it costs.
How many is too many
A page carrying a box, a pull quote and a figure has no main text. It has three competing starts, and a reader who cannot tell what to read next reads nothing.
One device per spread is a sane working limit for most nonfiction, two if one of them is small. Keep pull quotes off chapter opening pages, where they compete with the display type, and never set one facing another across a spread.
Keep them short — a sentence, rarely two — and cut rather than rewrite. Trimming a quoted line to its spine is fine; changing a word is not, because the reader who reaches the original three inches later hits a mismatch. Figures and tables count toward the same budget: Tables, charts and data in a printed book.
In the ebook, position disappears
Reflowable text has no fixed page, so every one of these devices becomes a block in the stream. A sidebar survives that well — it is still clearly set apart, still read after the paragraph it followed. A pull quote does not: it becomes a duplicated sentence the reader meets twice within one screen, which reads as an editing error. Most books are better off dropping pull quotes from the EPUB.
Anything whose meaning depends on sitting beside a specific paragraph — a marginal note, a box the text refers to as "opposite" — has to be rewritten for the digital edition to say what it means without pointing. Reflowable text, and the things that break it covers the rest of that ground.
Typeset your book
The Interior Formatter is free to use: name your book, bring your manuscript, and it sets real pages you can read before you commit to anything. You only pay when you want the files without the preview watermark.
Next: Tables, charts and data in a printed book · Also in this guide: Parts, sections and the pages between chapters · Footnotes, endnotes and the reader's patience · Reflowable text, and the things that break it