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Do-not page for the container devices, calling out tight, loose and inconsistent margins, off-grid and mixed corners, and the narrow-tube effect.
Summary
A misuse page for the rounded container, laying out a grid of "don't" examples, margins too tight, too loose or inconsistent, corners off the grid or mixed-radius, and tube-like narrow containers, each struck through in red.
Visual description
Cream (#F4F0E8) page with the standard header (title "Rounded boxes / Misuse", page "145"). The left column explains margins and radius must follow the base grid. The main area is a four-column grid of grey container examples under bold rule-headings, each wrong example crossed by a diagonal red strike. Column one stacks "Don't have margins too tight", "Don't have margins too loose" and "Don't have inconsistent margins" with grey cards holding mis-set lorem text. Columns two and three show large grey squares labeled "Don't have corners aligned off the base grid" and "Don't have mixed-rounded corners". Column four, "Very Narrow Containers", shows two thin bars with red "12pt" and "6pt" callouts warning against corners touching into a tube.
Key takeaway
The convention of a single red diagonal strike to mark every prohibited example, scanning instantly as "don't". Grouping margin, corner and proportion failures on one page so the rules read as a checklist. The specific narrow-container "tube" warning with the halve-the-radius fix is a sharp, reusable detail.
Reuse notes
A reusable misuse-page template for any component or shape spec: neutral grey examples, bold do-not headings, red strikes. Pairs directly with the container intro, sizing and uses pages. The exact pt values are F1-specific; keep the pattern, change the numbers.
From this deck: Rounded boxes misuse spec
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