If you notice the listed sizes of the art works above and below, you'll notice that they're all pretty small - and it's because they were all made in postcard format, as a result of Moriz Jung's participation in the "Wiener Werkstätte," which translates to "Vienna Workshop." This was an artist and artisan co-op, which brought together architects, artists, designers and artisans working in ceramics, fashion, silver, furniture and the graphic arts. The purpose of this co-op, which was indeed a business, was to create beautiful but also useful and functional objects, a sort of design studio. As far as Jung and his postcards, these were created as collector's items, which was a popular thing to collect at that time.
From a historical perspective, these first two postcards are interesting, in that Jung is making fun of airplanes, which - we all take for granted now - but air travel was something new at the time that he drew these. Note the dates of these first two - 1911 - and keep in mind that the Wright brothers invented and flew the first airplane in 1903. In the image below left, Jung suggests that people flying planes might crash into rainbows, which seems ridiculous now, but when flight was brand new, as it was at the time, who really knew? Likewise, below right, Jung suggests the novel idea of a man using an airplane for a special delivery of flowers to a woman on the upper levels of a skyscraper. Even this concept requires a historical perspective: the first skyscrapers were built in the 1880s, in Chicago and New York. It's not exactly clear to me when skyscrapers were introduced in Vienna, but part of the name of the flower-delivery postcard is revealing, with the suggestion that this woman is on the "968th floor of a skyscraper," making this a humorous and futuristic vision.
