A good example of a vague concept is the concept of a heap of sand -- two or three grains of sand is not a heap, but a thousand is. So how many grains of sand does it take to make a heap? There is no clear line. It appears to be paradoxical to ask at what point a heap stops being a heap as grains are removed. This is known as the paradox of the heap or the sorites paradox (from the Greek language word for "heap").
... In the great division of the Hegelian school, he, in company with Michelet and others, formed the "centre," midway between Erdmann and Gabler on the one hand, and th ...