In heraldry, the background of the shield is called the field. The field is usually composed of one or more tinctures (colours or metals) or furs. The field may be divided or may consist of a variegated pattern.
In rare modern cases the field (or a subdivision thereof) is not a tincture, but is shown as a scene from a landscape. Landscape fields are regarded by many heralds as unheraldic and debased, as they defy the heraldic ideal of simple, boldly coloured images and cannot be consistently drawn from blazon.
The arms of Count Cesare Fani  are along the same lines, as the field is blazoned as "sky proper." The arms of the Inveraray and District Community Council in Scotland have as a field In waves of the sea. The correct language of heraldry is almost infinitely flexible and virtually any image may be blazoned in a correct manner, for example "sky proper" might be blazoned simply Azure, whilst "waves of the sea" might be blazoned correctly as Azure, 3 bars undee argent which would provide 3 wavy thick white lines on a blue field.
See also