Chicana theorist Gloria E. Anzaldúa notably emphasized the border as a "1,950 mile-long wound that does not heal." In referring to the border as a wound, writer Catherine Leen suggests that Anzaldúa recognizes "the trauma and indeed physical violence very often associated with crossing the border from Mexico to the US, but also underlies the fact that the cyclical nature of this immigration means that this process will continue and find little resolution." Anzaldúa writes that "la frontera" signals "the coming together of two self-consistent but habitually incompatible frames of reference cause "un choque", a cultural collision" because "the U.S.-Mexican border "es una herida abierta" where the Third World grates against the first and bleeds." Chicana/o and Mexican artists and filmmakers continue to address "the contentious issues of exploitation, exclusion, and conflict at the border and attempt to overturn border stereotypes" through their work. Luis Alberto Urrea writes "the border runs down the middle of me. I have a barbed wire fence neatly bisecting my heart."