From a logical point of view, vagueness is a problem. It even was called a “philosopher’s nightmare”; it is often only regarded as one of the logical shortcomings of natural languages. But nevertheless, vagueness also has some advantages, especially regarding everyday communication. It already begins in first language acquisition: Here are no sharp boundaries of predicates learned. Thanks to vagueness, we do not have to precisify predicates ad infinitum, we can communicate successfully and efficiently. Vague predicates also take into account the limitations of human perception.