Phenomenon Face reveals all that has been kept in our hearts and projects it into reality. The heart of man is not a simple thing. Whoever has a feeling towards a person in his deepest part of his heart, love, friendship, respect, hate, vengeance. Most of the time the person himself doesn’t even realize that he still keeps that feeling in his heart as long as there’s a feeling then you will not get away from the Phenomenon Face. Human feeling will not be erased so easily. Although user can consciously initiate the mental probing in order to find and project an image, the probing process itself isn't governed by their conscious mind. Hence, user does not consciously know what the image they seeks in another person's mind is. The three-dimensional images that Phenomenon Face causes appear similar to holograms, and can be seen by anyone in their vicinity. However, only the people who user derives the image will perceive it as "real," indistinguishable from the real person or object it portrays with the same shape and strength as the original.
Phenomenon Face can project mental images on several people at once. Each "victim" would see a different image, corresponding to his or her own individual concept of the kind of image that user sought. If, for example, user sought to make a group of people each see the object of his or her greatest fear, probably each person in the group would see an image of a different person. The seeming materialization of the object of his or her greatest fear or desire invariably has immediate emotional impact on the person from whom Phenomenon Face had drawn the image projected. The images dissolved and ceased to exist as soon as user ceases to maintain sufficient concentration to keep them visible.
This technique doesn't work on Yuan (probably because being him blind he can distinguish the illusion or because the illusion can't work because Yuan himself is a master of illusions, a soul eater or because he doesn't feel true feelings, as fear or love, for someone)