“Natura” is a short theatrical action by Italian dramaturge and director Romeo Castellucci based on “On the Nature and Origin of the Mind,” the second volume of Spinoza’s “Ethics.” After stepping through the silhouette of a woman cut out of a white wall, the audience discovers an immaculate stage where three figures exist without interacting with each other: a young woman (representing Light), a polyglot dog (representing a TV camera), and the emptiness of the woman’s silhouette (representing Spirit).