Types and Conceptual Models of Augmented Reality The definition of Augmented Reality is the most important step in the understanding of its concept, but it is only the first one. The next step that can contribute significantly to our understanding is the analysis of different types of AR and their possible classifications. This step is not as strictly logical as the definition of AR. Classifications can be based on a variety of principles and therefore can be rather dissimilar. There is no lack of taxonomies in the literature on Augmented Reality. Many authors and publications name and analyse the existing and future types of AR [2; 3; 4; 8; 24]. In this paper, we will try to consider only those types of AR that seem to be the most important and central for the further understanding of the conceptual models on which the notion of AR is based. Let’s start with a simple question and a simple answer. “... What exactly is AR? In its simplest form, AR is the art of super-imposing computer graphics over a live view of the real world” [4, p.xxi]. Definitely, this is an answer, but does it refer to Augmented Reality as a whole, or merely to a particular type of AR that exists alongside with several others? Augmented Reality based on computer graphics is not the only type of AR related to human senses, i.e. the five natural powers of sight, hearing, feeling, taste and smell. Figure 6 shows a sensory-based classification of AR