 However, on the basis of this point it should also be clear that the conclusion does apply to this figure, and every other visible triangle inscribed in a semicircle as well, insofar as, and to the extent that, it manages to imitate the properties of the perfect object in our mind. Therefore, the Platonic answer to the question of what this demonstration was about, namely, that it was about a perfect, ideal triangle, which is invisible to the eyes, but is graspable by our understanding, at once provides us with an explanation of the possibility of universal, necessary knowledge. By knowing the properties of the Form or Idea, we know all its particulars, i.e., all the things that imitate it, insofar as they imitate or participate in it. So, the Form itself is a universal entity, a universal model of all its particulars; and since it is the knowledge of this universal entity that can enable us to know at once all its particulars, it is absolutely vital for us to know what it is, what it is like, and exactly how it is related to its particulars. However, obviously, all these questions presuppose that it is at all, namely, that such a universal entity exists.