During the 1890s, a German woman named Agnes Richter was institutionalized for a mental illness. She wasn't allowed to use conventional writing instruments, but she was allowed to sew. Richter was a good seamstress, so she embroidered hundreds of mysterious words and phrases on a straightjacket. Gail Hornstein, a psychologist, wrote a book about her exploration of this unique artifact and what it reveals about Richter's mind.