Conservators, museologists, and architects make extremely complex decisions capable of affecting the way people perceive monuments. One might give this idea deeper consideration while pondering anastylosis, which should be done in such a way that it is possible to recognize the original and newlyadded elements. The definitions in force do not, however, explain how to make such a distinction. By using eye-tracking research, we can learn how observers look at historic objects that have been reassembled again. By combining the observation of visual behaviours with a survey of people looking at such objects, it is possible to see how the process of classifying what is new and old actually works. This knowledge allows for both a more conscious approach to heritage management process and pro-social design of exhibitions at archaeological sites, museums, and virtual reality.