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What a theme does not change
The forecast
Every set draws the same numbers from the same sources. A theme is type, colour and chrome — it never touches what the graphic says.
The warning colours
Severe red and the hazard palette are fixed across all three sets and are not repainted by your brand accent either. A viewer should not have to learn a new colour code per publisher.
The provenance
Issue time and data credit sit on every board in every set. Your byline goes in front of the credit, never over it.