2.171 A picture can depict any reality whose form it has. A spatial picture
can depict anything spatial, a coloured one anything coloured, etc.


2.172 A picture cannot, however, depict its pictorial form: it displays it.


2.173 A picture represents its subject from a position outside it. (Its
standpoint is its representational form.) That is why a picture represents
its subject correctly or incorrectly.


2.174 A picture cannot, however, place itself outside its representational
form.


2.18 What any picture, of whatever form, must have in common with reality,
in order to be able to depict it--correctly or incorrectly--in any way at
all, is logical form, i.e. the form of reality.


2.181 A picture whose pictorial form is logical form is called a logical
picture.


2.182 Every picture is at the same time a logical one. (On the other hand,
not every picture is, for example, a spatial one.)