In this talk I will present a logical framework for multi-agent visual-epistemic reasoning, where each agent receives visual information from the environment via mobile camera with a given angle of vision in the plane. The agents can thus observe their surroundings and each other and can reason about each other's observation abilities and knowledge derived from these observations. I will introduce suitable logical languages for formalising such reasoning, involving atomic formulae stating what agents can see, multi-agent epistemic operators, as well as dynamic operators reflecting the ability of agents (or, their cameras) to move and turn around. I will then introduce several diff erent types of models for these languages and will discuss their expressiveness and axiomatisation problems, and how they interact with the underlying geometric constraints and assumptions, thus giving rise to a specific instance of correspondence theory.

This talk is based on a recent joint work with Olivier Gasquet (Univ. Paul Sabatier, IRIT, Toulouse) and Franois Schwarzentruber (ENS Rennes).