Black & White Roman Egyptian America
Diagonal White to Black Separated or vice versa?
This black and white coloring procedure model removing some white by black or more or less black by white can easily be applied to other flags, especially
Since the Britannia flag is mirrored by it’s centre it could be extended by a black diamond, cross, star, circle or ellipsis on white back or white point symmetric shape on black background.
The Russian and Frech flag shapes and fields are point symmetrical too, but not their color distribution.