What revolutionary movement that sought to define a Mexican identity did this Mexican painter whose work includes "Self-Portrait with Thorn Necklace and Hummingbird" participate in?
Self-Portrait with Thorn Necklace and Hummingbird: Self-Portrait with Thorn Necklace and Hummingbird ("Autorretrato con Collar de Espinas") is a 1940 painting by Mexican painter Frida Kahlo. Frida Kahlo:  In addition to belonging to the post-revolutionary "Mexicanidad" movement, which sought to define a Mexican identity, Kahlo has been described as a Surrealist or magical realist.
Mexicanidad