Guarana is a reflective architecture that aims at simplicity, flexibility, security and reuse of meta-level code. It features a run-time meta-object protocol that provides for easy composition of meta-objects and allows for dynamic reconfiguration. Meta-objects can be combined through composers, that provide the glue code for them to work together, delegating control to them and resolving conflicts when they arise. Since composers are meta-objects, they can be further composed.