What does a piece of art have to have in order for the audience to have an aesthetic reaction to it and how does that differ in the case of a forgery?

The word aesthetic is defined as concerning beauty, the appreciation of beauty, and able to evoke emotion, so in theory a piece of art must have these criteria to have an aesthetic effect on its audience. So then what about a forgery? If it has meets all of these criteria, does it have an aesthetic effect on the audience? I would say the answer is yes, however, the aesthetic effect of a forgery is very different from that of an original. Aesthetic judgement is often intellectual and interpretive in some small way or another, it isn't all about the beauty of an art piece. Often times meaning and symbols are interlaced into the piece by the viewer, becoming a part of how the piece is judged. Many say that will and desire are not factors in judging aesthetically, yet preference and choice seem to be important to the process. 

When comparing an original to a forgery, if you only look at what is within the four corners of the canvas, then you could assert that a forgery is aesthetically comparable to the original. However, the emotional reaction you have to the original, say the Mona Lisa in Louvre, would be very different from the experience of seeing a copy of it in a book. Often times the 'intellect' part of aesthetics incorporates the artist in part of the judgment, in that your reaction to a painting can be changed simply by knowing whom, or information about the artist of the painting. If you were to look at a painting of a butterfly, for example, and you were told that it was painted by a severely autistic person, your reaction to it would be very different than that of if you were told that the painting was done by the president or a child in a concentration camp or even Monet. In this respect, it is clear that the original is significantly different from the forgery. The forgery lacks the 'moment of genius' that is found in the original. That being said is why a forgery cannot be called aesthetically the same as an original on an emotional or even intellectual level.