The impressive development of technologies is reducing the gulf between the physical and the digital matter, reality and virtuality. In the short future, the design and development of “augmented worlds” - as software systems extending the physical space and environment with computational functionalities and an augmented-reality based appearance - could become an important aspect of programming, calling for novel programming abstractions and techniques. In this paper we introduce this vision, discussing mirror worlds as augmented worlds programmed in terms of agent-oriented abstractions.