They are images meant to awaken the instinctive understanding of the viewer. Since they come from 1895 Vienna, the instinctive ability of the modern viewer may be limited, or may allow for a peek into the mind of the past. The image of electricity is most compelling, although I personally don’t recognize every aspect of that drawing. These images can be a puzzle, with many pieces combined to form a greater whole. The image marked ’empire’ has a number of turn of the century themes combined to show the hope for a Western European Empire: medicine, industry, foreign goods, a connected postal system, etc. And then, there are the beer and wine images.
All of the drawings are provided in high quality with a friendly CC 3.0 license. Prost!