The red star Aldebaran is indeed the eye of Taurus, and it is part of a a V-shaped decoration of dots. But that group of dots is called "Hyades." The much more famous Pleiades star cluster is actually the shoulder of Taurus. Aldebaran has never been part of the Pleiades cluster. What is interesting is that the pattern of dots around the eye of the Lascaux bull does bear a remarkable similarity to Pleiades. While the brightest star in Pleiades is Alcyone, the eye on the Lascaux bull is in the position of Maia.