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Quick answers
When should I pick Open icon systems?
When the story is: slides, product UI, posters, school worksheets.
When should I avoid Open icon systems?
Skip it in cases like: mixing five icon styles on one slide.
Who invented or popularised it?
Feather to Lucide and other ISC/MIT SVG icon families on GitHub
What does it encode?
stroke or fill metaphors at a shared grid and weight
Is it OK in ads?
Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure.
Will a teacher accept it?
Yes for lab reports and poster boards if axes, units and a source line are present.
Open icon systems encodes values as stroke or fill metaphors at a shared grid and weight. Feather to Lucide and other ISC/MIT SVG icon families on GitHub.
In reports, ads and assignments it fits slides, product UI, posters, school worksheets. Skip it when mixing five icon styles on one slide.
Mistakes
- Failure modes 1 — mixing five icon styles on one slide
- Failure modes 2 — 3-D pies and perspective bars
- Failure modes 3 — Dual axes that fake a correlation
- Failure modes 4 — Truncated axes that shout a small delta
- Failure modes 5 — Legend only, no direct labels
- Failure modes 6 — Missing source, unit or period
Fixes
- Fixes 1 — Return to slides, product UI, posters, school worksheets.
- Fixes 2 — Flat, one axis, direct labels.
- Fixes 3 — Color-blind-safe palette plus pattern.
- Fixes 4 — Rewrite the title as a claim and add a source line.
Open icon systems: honour stroke or fill metaphors at a shared grid and weight, and switch when mixing five icon styles on one slide.