Claude Cahun (1894-1954) was a French artist and writer who is known for challenging gender norms and exploring queer identities in their artwork. Cahun's work often blurred the boundaries between gender, identity, and performance, and they used photography and self-portraiture to express their genderqueer identity.

In their self-portraits, Cahun frequently adopted androgynous, ambiguous, and surreal identities, using costumes, makeup, and props to transform their appearance. They explored themes of gender fluidity, non-binary identities, and the relationship between the self and the body.

Moreover, Cahun's use of makeup further blurs gender lines, as they appear to be wearing both masculine and feminine makeup. They have a thin, drawn-on mustache and a heavy black line around their eyes, which could be seen as masculine makeup. Yet, they also have rosy cheeks and red lipstick, which could be seen as traditionally feminine makeup.

In their series of self-portraits titled "I Am in Training Don't Kiss Me," Cahun presented themselves in various gender-bending roles, including a soldier, a clown, and a bride. The photographs play with traditional gender roles and blur the boundaries between masculine and feminine identities.

Cahun also used their writing to express their genderqueer identity. In their book "Aveux Non Avenus" (Disavowals), they wrote about their experiences of gender and identity in a series of poetic and philosophical fragments. The book explores the complexity of the self and the role of language in shaping our understanding of identity.

Overall, Cahun's artwork challenges traditional notions of gender and identity and expresses a genderqueer perspective that was ahead of its time.