IMPLICIT INVOCATION
DEFINITION:
A system in which communication between components is relatively
indirect, taking place in the form of discrete events placed on and
read from a common event bus. 

IS IT ABOUT FITNESS FOR FUTURE?
We would argue that this architectural pattern facilititates fitness
for future largely because of the decoupling of components due to the
use of the event bus.

IF SO, WHAT CHANGES AND WHAT STAYS THE SAME?
It allows for easier adding of functionality in the form of a separate
component. This is because of the low coupling between components, and the
only form of communication being indirect. New components can be added
to the bus at will, provided that they adhere to the event format on
said bus.

It is however much harder to change the way that data is represented in
an event itself, since this data is possibly used by a large number of
heterogeneous components which rely on the event structure being similar
to how it was when that component was added to the bus.

IF NOT, WHAT IS IT ABOUT?