In this work, Marcos Del Roio analyses Gramsci's pre-prison political-theoretical activity in light of a radical thesis: that throughout Gramsci's life we see a total continuity between his political praxis and his philosophical reflection. That is not to ignore the changes, turns, and even fractures in the Sardinian communist's thinking across his brief but rich existence. This book's title, referring to the metaphor of a ray of light passing through a prism, expresses this counterpoint between identity and diversity.