Deleuze's works fall into two groups: on one hand, monographs interpreting the work of other philosophers (Spinoza, Leibniz, Hume, Kant, Nietzsche, Bergson, Foucault) and artists (Proust, Kafka, Francis Bacon); on the other, eclectic philosophical tomes organized by concept (e.g., difference, sense, events, schizophrenia, cinema, philosophy). Regardless of topic, however, Deleuze consistently develops variations on similar ideas.