in the form of a square fig4 c shows how the ar object of fig4 b is changed for the insertion into the environmental image of fig4 a with respect to its size and its orientation position u2014 that is is enlarged concretely here and rotated fig4 d then shows the overlaying of an environmental image of the real object and of the ar object wherein parts of the ar object in the field of vision u2014 top view on the sheet plane u2014 which lie behind the real object 14 are hidden and are not depicted u2014 that is are not visible for the observer u2014 as can be seen in fig4 d the ar object appears to lie behind the real object 14 this is shown in fig5 a 5c with the aid of two simple real objects 14 1 and 14 2 in the form of a square and a circle and of coordinate systems 16 1 16 2 16 3 as an ar object 16 the coordinate system 16 1 lies in the center of the object 14 1 and in the overlap area of the two the coordinate system 16 1 is depicted as a broken line to the observer furthermore the coordinate system 16 2 lies in fig5.