“…Visuals are part of the nonverbal component of textbooks, which is referred to in various ways across pedagogical, didactic and psychological research (compare Behnke, 2017;Janko & Knecht, 2013;Veriki, 2002). The overview study analysis methodical approaches to the research of visuals in geography textbooks performed by Trahorsch, Bláha & Janko (2018) identified a total of 20 special terms, 3 all of which are more or less synonyms of the term visual; as these terms are highly general and are based on general theories of visualisation and communication (Veriki, 2002;Spousta, 2007), it will be used further in this study. The subjectivity and ambiguity of depiction or illustration of the visualised phenomenon is a typical characteristic of visuals, as different authors may choose various means of expression (such as colour, symbol shapes, etc.).…”