Rosier’s work stems from her interest in the physical and psychological experience of ancient rites and rituals.
Her research often embodies fictional offshoots or parts of a narrative, where constellations of self-made costumes, mystic representations of animals and nature often seem like props, an abandoned stage set, or solitary protagonists of an unfamiliar yet compelling reality.

Through the combination of painting, film, dance and theatre, Rosier constructs dreamlike situations that allow the beholder to lose any sense of space and time, opening a portal between conscious and unconscious realms.
Rosier creates art that comments on and illustrates the need to return to harmonious ways of integrating human activity with the “natural environment”, including pre-industrial practices that might seem anti- rational, observing the world from the vantage of the present-day countryside.

A selected list of her recent solo exhibitions and performances includes: Dans les champs d’intensive prospérité, Fondation d’entreprise Pernod Ricard, Paris (2023); Sketches in the margin, jevouspropose, Zürich (2021); Le Massacre du printemps, Museo MADRE, Naples (2020); MASP, Sao Paulo (2020); How to Dance in the Fields, Razem Pamoja Foundation, Warsaw (2019); Figures of Climax of the Impersonal Empire, Fondazione Guido Ludovico Luzzatto, Milan (2018); In Revolution. Resolution of Some Hierarchic Orders, Der Tank Institut Kunst, Basel (2016); Organs of the Whale, Dortmunder Kunstverein, Dortmund (2012); Necklace of Fake Teeth, Camden Arts Centre, London (2011); Mathilde Rosier. Rite de passage, Kunstpalais, Erlangen (2011); Find circumstances in the antechamber, Musée Jeu de Paume, Paris (2011); Play for a stage of the Natural Theatre of Cruelty, performance at Serpentine Gallery, London (2009).

She has shown and performed in several group exhibitions such as: Utopia Distopia: il mito del progresso partendo dal sud, Museo MADRE, Naples (2021); Kosmos Emma Kunz, Aargauer Kunsthaus, Aarau (2021) travelled to Tabakalera, San Sebastiàn (2022); Freedoms, Razem Pamoja Foundation, Warsaw (2019); Metamorphoses – Let Everything Happen to You, Castello di Rivoli, Turin (2018); Sureghes – writing the Mountains, 6th Biennale Gherdëina, Ortisei – Italy (2018); The Waves of the Oh!s and the Ah!s, performance, Chiesa di San Lorenzo, Venice (2018); Volcano Extravaganza, Fiorucci Art Trust, Stromboli (2015); Year After Year. Opere su carta dalla UBS Art Collection, Galleria d’Arte Moderna, Milan (2014); Made in Germany Zwei, Kunstverein Hannover, Sprengel Museum, kestnergesellschaft, Hannover (2012); Transfer France – NRW, Am Anfang war ich am Ende – Au debut j’etais au bout, Städtisches Museum Abteiberg, Mönchengladbach (2010); Head-Wig (Portrait of an exhibition), Camden Arts Centre, London (2009).