This is Kalyn Heffernan. She is 24 years old, weighs 53 pounds, and measures three feet, six inches tall. She’s light enough to carry, compact enough to hide under a winter coat, and is sometimes mistaken for a child. But Kalyn, who has the brittle-bone disability osteogenesis imperfecta, is hardly innocent, precious, or inconspicuous: The Colorado native dabbles in graffiti, cusses gloriously, and has a septum piercing. She raps, scribbles rhymes, and has been known to cover the viral YouTube video “My Vagina Ain’t Handicapped.” If you ask—and even if you don’t—she’ll eagerly lift her shirt to show off the words “CRIP LIFE” inked on her stomach, an homage to Tupac Shakur’s THUG LIFE tattoo.