Slavoj Zizek ( ( listen) SLAH-voy ZHIZH-ek; Slovene: ['slavoj 'ZiZek]; born 21 March 1949) is a Slovenian continental philosopher. He is a senior researcher at the Institute for Sociology and Philosophy at the University of Ljubljana, Global Distinguished Professor of German at New York University, and international director of the Birkbeck Institute for the Humanities of the University of London. He works in subjects including continental philosophy, political theory, cultural studies, psychoanalysis, film criticism, Marxism, Hegelianism and theology. In 1989, Zizek published his first English text, The Sublime Object of Ideology, in which he departed from traditional Marxist theory to develop a materialist conception of ideology that drew heavily on Lacanian psychoanalysis and Hegelian idealism.
Ontology, ideology, and the Real
Zizek argues that:  (Against Marx's concept of ideology as described in The German Ideology), False consciousness prevents people from seeing how things really are. (Building upon Althusser), Ideology is thoroughly unconscious and functions as a series of justifications and spontaneous socio-symbolic rituals which support virtual authorities.  The Real is not experienced as something which is ordered in a way that gives satisfactory meaning to all its parts in relation to one another. Instead the Real is experienced as through the lens of hegemonic systems of representation and reproduction, while resisting full inscription into ordering system ascribed to it. This in turn may lead subjects to experience the Real as generating political resistance.  (Drawing on Lacan's notion of the barred subject), The subject is a purely negative entity, a void of negativity (in the Hegelian sense), which allows for the flexibility and reflexivity of the cartesian Cogito (Transcendental Subject). Though consciousness is opaque (following Hegel), the epistemological gap between the In-itself and For-itself is immanent to reality itself;. The antinomies of Kant, quantum physics, and Badiou's 'materialist' principle that 'The One is Not', point towards an inconsistent ("Barred") Real itself (that Lacan conceptualized prior).[opaque language]  Although there are multiple Symbolic interpretations of the Real, they are not all relatively "true". Two instances of the Real can be identified: the abject Real (or "real Real"), which cannot be wholly integrated into the symbolic order, and the symbolic Real, a set of signifiers that can never be properly integrated into the horizon of sense of a subject. The truth is revealed in the process of transiting the contradictions; or the real is a "minimal difference", the gap between the infinite judgement of a reductionist materialism and experience as lived, the "Parallax" of dialectical antagonisms are inherent to reality itself, and Dialectical Materialism (contra Engels) is a new materialist Hegelianism, incorporating the insights of Lacanian psychoanalysis, set theory, quantum physics, and contemporary continental philosophy.

Q: What is Ontology
A: unknown

Q: What was Slavoj ideology
A: Ideology is thoroughly unconscious and functions as a series of justifications and spontaneous socio-symbolic rituals
What rituals did he think it reflected
socio-symbolic rituals which support virtual authorities.
socio-symbolic rituals which support virtual authorities.