The virtues are a beauty of the Soul, a beauty authentic beyond any of these others. The Soul he adds is not a simple unity though. He does warn us to beware of letting the Soul fall in with the ugly though, for it will shy away from it, shrinking within itself, denying the thing, turning away from it, resenting it. If bad, it remains outside Reason and Idea, ugly by its isolation from the Divine-Thought link. This he defines as the Absolute Ugly.
Soul then interacts on the beautiful.
In the example of a man who stumbles upon a house, built, but pleasing to the eye, Plotinus suggests that the perceptive faculty kicks in using Ideal-Principle to analyze parts, then unity of the whole, finding it better that the common shape, recognizing its unity as friendly. There are even higher and earlier beauties than this. Since we as humans are by the senses, we can never know them, according to Plotinus, but the Soul can and it proclaims them. This vision only comes to those who see with the Soul's eyes, and once seeing the vision, then we are joyful for we are moving to the realm of truth. It must be induced by Beauty.