“I am tired, tired of standing up, being counted, tired of ‘having a voice,’ or worse, ‘being a role model,’ Tired, true, of being a featured member of my racial group and/or my gender niche.” Those words come at the beginning of an artist’s statement making a splash on the internet since Tuesday afternoon, when it was released by Kara Walker — who, it so happens, has long been heralded as one of the most prominent and talented black female artists, praised for making work about her race and gender.