The Georgia Negro: A Social Study - Bar graph shows percentage of population by age of African Americans in Georgia compared to the French [LCCN2013650428]
The pattern
This still is filed under Data as proof.
Define
A chart, map, or count that is the argument, not an illustration next to the argument.
Mechanism
Sighted evidence. The reader is asked to believe their eyes: a bar, a share, a spread on a map.
Verdict
The claim is comparative or quantitative and the figure can be read without a caption doing the sell.
Why it works
Choosing France as the comparison is the entire strategy - the plate was hung in Paris, so the benchmark is the audience itself, and every French visitor reads the data against a population they already understand rather than against a number they have to trust. Stacking the pair tight so the two bars form a single notched shape means the difference is read as a step, not as two lengths to be measured. Black against gold is legible at exhibition distance and needs the legend only once. The crossover at 20-30, where the colours exchange dominance, gives the whole sheet one visible hinge to hang the conclusion on.
Steal this when
When you are presenting to an audience that already has its own baseline - a client's own last year, a country's own figures, a competitor they measure themselves against. Benchmark against them rather than an industry average, and the chart stops needing to be believed.