Geometric shapes encodes values as closed outlines whose corners and symmetry carry meaning. Euclid’s Elements (~300 BCE) still names the school set; modern UI reuses it.
In reports, ads and assignments it fits icons, posters, worksheets, brand marks. Skip it when you need to encode a quantity — use a chart, not a pretty triangle.
Mistakes
- Failure modes 1 — you need to encode a quantity — use a chart, not a pretty triangle
- 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 icons, posters, worksheets, brand marks.
- 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.
Geometric shapes: honour closed outlines whose corners and symmetry carry meaning, and switch when you need to encode a quantity — use a chart, not a pretty triangle.