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In this paper we describe how to build software architectures as acomposition of state machines, using ideas and principles from the field ofDomain-Driven Design. By definition, our approach is modular, allowing one tocompose independent subcomponents to create bigger systems, and representable,allowing the implementation of a system to be kept in sync with its graphicalrepresentation.  In addition to the design itself we introduce the Crem library, whichprovides a concrete state machine implementation that is both compositional andrepresentable, Crem uses Haskell's advanced type-level features to allow usersto specify allowed and forbidden state transitions, and to encode complex statemachine -- and therefore domain-specific -- properties. Moreover, since Crem'sstate machines are representable, Crem can automatically generate graphicalrepresentations of systems from their domain implementations.

Cr\`eme de la Crem: Composable Representable Executable Machines (Architectural Pearl)