Does anybody know of any paper/book/study about the philosophical/ideological meaning behind this artistic style?
I have not seen any serious academic study on the aesthetic used in illustration, graphic design, or photography however as an artist I've definitely noted the zeitgeist. They all tend to follow similar tropes or themes common to that period.
My interest started after observing a recurring style of photography. I had an example of documentation that outlined how soldiers were to be photographed. This showed correct camera angles, framing, and incorrect styles for photographers. There was also guidance for portrait photography where you see distinctive sitting styles. A popular portrait of the time period involves not looking at the camera but looking off to the left or right. Often, though not always, those who do look directly into the camera for a portrait have either an intense glare or some form of attempt to smolder going on. Looking through hundreds of portraits of individuals not looking at the camera, thereby not looking at you, becomes somewhat unsettling. Definitely leaves an impression on you.
Josef Sepp Lanier, indicative of the heroic portrait style of the time, an indifference to the viewer.
Josef Sepp Lanier Portraitfotos kopie.jpg
The graphic design of the time is of course also very much following coming out to the 20s deco era. This is likely the movement piece of illustration or design you've noticed as well as it's angular nature. Photography again follows these dictums in artistic style.
Movement to contact
Panzergrenadiere kopie.jpg
Angular illustrative style
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Art and photography mirroring one another
postkarte.jpg
Der-Landser-Grossband-Nr-1266-Hans-Henkenschuh-K-Kollatz.jpg
Good observation on your part.
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