It might be (for example) when some static method of the class is used.

All extension methods need to be defined as a static method.

Only static methods can be invoked without a reference to an object.

As the static methods lead to more consistent values some of these can be described.

Different static methods exist to broaden the area of the "sweet spot".

One notable exclusion is the ability to import static methods from other classes.

The single-serving visitor is called through the intermediate of static methods.

In static methods (created with the decorator), no special first argument exists.

There can only be one, and it is a static method in a class.

Neither the instance, nor the class object is passed to a static method.