They cannot show changes in altitude - the third dimension. Some information can be given through contour lines but that is not easily interpreted visually - it is difficult to distinguish between convex and concave shapes. It is possible to get around that by using colours but those are also used for administrative or political regions.
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Distortion
Distortion
Distortion
1) Separate the vectors into components (if they are not already expressed as components). 2) Add each of the components separately. 3) If required, convert the vectors back to some other form. For twodimensional vectors, that would polar form.
You do not. You see it stereoscopically, but the brain compares the images with experience and assumes threedimensional interpretations. This can be used to fool people with optical illusions. Forms that are possible in a twodimensional world, but does not have a representation in 3D that makes sense.