 Fimbriation, the surrounding of a charge by a thin border, can obviate what would otherwise be a violation of the rule, as in the Union Jack (which, although a flag rather than a shield, was designed using heraldic principles).The "divise", a thin band running underneath the chief in French heraldry, can also obviate a violation, as can the parallel "fillet" in English heraldry.This rule is so closely followed that arms that violate it are called "armes fausses" (false arms) or "armes à enquérir" (arms of enquiry); any violation is presumed to be intentional, to invite the viewer to ask how it came to pass.