Maurice Quillinan's artistic practice is deeply rooted in exploring themes of displacement, cultural exchange, and memory. His work often serves as a reflection on the metaphysical challenges of existence, informed by personal experiences, such as his residency in India. Through his art, Quillinan seeks to address both personal and fictional identities, consistently questioning notions of ownership and identity.

A characteristic of Quillinan's style is the interplay between abstraction and realism. He employs recurring motifs such as landscapes, horses, and human figures, not merely as representational elements, but as metaphors. These symbols are used to navigate complex ideas about belonging, the impact of societal forces, and the individual's journey through different cultural contexts. His work on paper, often large-format, utilizes charcoal and pastel to convey layered textures and emotive depths.

Conceptually, Quillinan emphasizes the importance of open narratives and dialogues. His pieces are designed to provoke reflection on the interconnectedness of individuals and the necessity of listening to diverse stories. This approach underscores his belief in the vital nature of each individual's narrative, fostering a sense of shared humanity and understanding across cultural divides.