Renumbered again so that the messaging OO style comes immediately after the hash OO style

13-hollywood/README.md

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+Style #12
+==============================
+
+Constraints:
+
+- Larger problem is decomposed into entities using some form of abstraction
+  (objects, modules or similar)
+
+- The entities are never called on directly for actions
+
+- The entities provide interfaces for other entities to be
+  able to register callbacks
+
+- At certain points of the computation, the entities call on the other
+  entities that have registered for callbacks
+
+Possible names:
+
+- Hollywood agent: "don't call us, we'll call you"
+- Inversion of control
+- Callback heaven/hell