The categories of visual-verbal relations on reasoning: (a) illustrative (the image adds to the verbal without being embedded in the reasoning); (b) exemplifying/explanatory (the image gives an example or explains a reasoning process); (c) the image is the starting point on which reasoning is developed; (d) the image is the fundamental tool in a mode of reasoning; (e) The image is the product of a mode of reasoning; (f) the organizational character tool (the image organizes the outcome of a mode of reasoning); and (g) Complementary (the content of the image complements to the reasoning of the verbal text)