Abstract

A riddle: You will find me at the beginning, and often at the end, but never in the middle. My head is 20ft long, but my tail is shorter. I am occasionally blank, mostly silent, and very hard-working. I am meant to be partly read, and partly viewed, and am full of stories—but if you ever actually see the real me it is because someone screwed up. Even though I am designed to be invisible most people know me when they see me. What am I?