Viewing device and book-type arrangement of a plurality of interconnected viewing devices

A viewing device with a housing having a front wall and a rear wall, wherein at least the front wall has at least one viewing opening for viewing a flat object which is located inside the housing on an object carrier, and wherein the front and rear walls are interconnected along two opposing connecting lines such that they are arranged to be spaced apart from one another after the transition from a rest position, in which they lie flat one against the other, into a viewing position, characterized by the features:

• a) the viewing device has, in the vicinity of the first connecting line between the front and rear walls, a first folding line in the front wall, so that the housing forms a side wall after a viewing position between the first connecting line and the first folding line is achieved;
• and
• b) a cover element is fastened to the wall region, which forms the side wall, of the front wall, which cover element can be pivoted from a closed position, in which it at least partially covers the front wall on the outside, into an opened position, in which the side wall is erect.