FOG is a filmic essay about the phenomenon of "brain fog," a state of consciousness provoked through an overload of information. Resulting from it is a certain daze and the incapability to think straight. This experience becomes a starting point to contemplate thought processes at large. In the film, the fog functions as the central metaphor from which all trails of thought emerge. By drawing on examples from recent film history, the film arrives at questions about the materiality of the medium and that of thought itself.