In addition to the static diagrams, Structurizr also supports the creation of a simple dynamic diagram, which can be useful when you want to show how elements in a static model collaborate at runtime to implement a user story, use case, feature, etc.
The dynamic diagram in Structurizr is based upon a UML communication diagram (previously known as a "UML collaboration diagram"). This is similar to a UML sequence diagram although it allows a free-form arrangement of diagram elements with numbered interactions to indicate ordering. As illustrated by the diagrams below, the interactions can be animated.
This example diagram shows a fictional asynchronous message-based system and how messages are sent/received in parallel. The full-size diagram can be found here.