Marble diagrams are a great way to explain how an operator works. However, they are not suited to describe how a program, a function, or a component works. Marble diagrams can show from example how a transformation on one observable is applied, but they cannot be used to describe how operators are combined to achieve a more complex operation on the data. We need a kind of diagram that shows the complete transformations applied on observables without the details of each operator being used. We need a diagram in which one considers that the operators are known by the reader but the overall behavior of a component must be described.