Question: 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?
Sentence (from "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.
Relevant evidence: Yes