A blend composite defines the rule according to which a drawing primitive
(known as the source) is mixed with existing graphics (know as the
destination.)
A utility class that holds a Graphics2D object and is able to reset it back to its original configuration,
as this is often more efficient than creating a new graphics instance.
Even though elements of this type can have an id, it doesn't provide any benefit as you
can't do anything with it (per contract of subclassing this type).