In general though, both are art movements from roughly the same time period with roughly the same basic principles. For someone unfamiliar with art history, it can be confusing in a way that doesn’t happen with day, Medieval vs. Neoclassical architecture.
Art Déco first appeared in 1910, and became much more popular in the 1920s, after the end of WWI. See https://en.wikipedia.org/wiki/Art_Deco
I wouldn't call pre-WWI and post-WWI "roughly the same time period". Not by a long stretch.
The length of time between them is not relevant in this case. What is relevant is the events that occurred between them.
Like the pre-atomic age and the post-atomic age. The events themselves in Hiroshima and Nagasaki were relatively short-lived. But their impact on this world greatly exceeded the time immediately before those two events and the time immediately after those events.
This is all pretty clearly laid out in the historical literature that you yourself linked to. You don't seem to understand how art movements work; there is not a firm dividing line when one ends and the next begins.
Beyond that, the question was about why people mix the two. Your nit-picking about how we should divide history is irrelevant to the discussion.
And I lived in Brussels, Belgium for almost eight years, in a house that was built in 1910 (according to the numbers formed into the bricks), and I lived about two blocks away from Hotel Horta. We have several coffee table books on Art Nouveau and Art Deco, some of which you can no longer find.
So, I am very well acquainted with both styles and when they were common. I also make a point of reading articles at any links that I include for reference.
This is the subject of the grandparent post that I was replying to. Yes, in actuality, they overlapped a bit, and Art Nouveau waned as Art Deco rose – although again, this is not so clear cut in other art fields as it is in architecture; e.g., jewelry or furniture.
And while Art Deco got started before WWI, it didn't really take off until after WWI.
Just like Art Nouveau that got started in the 1890s, but didn't really take off until after the International Paris Exhibition in 1900.
Both styles took several years to get started and really take off. And Art Deco didn't really take off until after WWI.
However, both were heavily inspired by Arts & Crafts (1860s-1920s). They just focused on and innovated on differents aspects of it.
Could it be that the most acclaimed expressions of art nouveau were the product of a gilded age, while the bauhaus legacy was mostly enacted during the postwar period where speed of rebuilding was more important that quality of buildings?
Deco and Bauhaus both seem to sometimes share an excitement towards mass production and materials themselves.
Art Deco shows off luxury and wealth, which is not very far from truth to materials.
With art Nouveau I notice designs more than materials, unless they're simple natural things like wood, not really giving any sense of technical achievement or extravagance in the actual materials.
Bauhaus seems to deliberately design things that would not work without the specific high end materials used, and look out of place if they are scratched, everything is pointing to the raw substance, the craftsmanship, the function, and the level of maintenance, and the design is just a frame.
Art Deco doesn't do the minimalism thing the same way,
I greatly prefer Art Nouveau, but it seems like both the aesthetic and philosophy of Bauhaus is everywhere.
Maybe there's something missing in my personality since I don't quite feel the appeal of simplicity and valuable materials as strongly as some, while the more philosophical types all seem to love it.
I think part of the mass appeal of Bauhaus might be because it got popular when tech was worse. You couldn't make a cheap CrapBoard thing and veneer it, unless you wanted it to peel in a week. That still happens, but it's possible to reliability do form, function, and material more separately.
Maybe people were tired of crappy goods that broke in a year, and Bauhaus was a way of advertising that you weren't doing that.
Now of course, durability seems random, and sometimes people take superficial Bauhaus elements and use them without the deep quality that it was supposed to be about, and it looks bad from the start and then breaks.
And we've got cheap synthetic materials that can be incredibly strong if you know how to design with them, although unfortunately they do not survive the trash compactor, when people toss them even though they're perfectly good, because people tend to see things without valuable substance as disposable.
https://onthearts.com/p/art-nouveau-vs-art-deco
I actually prefer Art Nouveau personally and wish there were more buildings that adopted the style. It seems like a good pairing for solarpunk architecture.
Otherwise, it’s interesting to me how Bauhaus seems to have aged much worse, probably because it’s more similar to modernism, both of which are origins for the “minimal” aesthetic style that is still prevalent. Looking at an old Art Deco or Art Nouveau building feels like peering into a lost world, while Bauhaus isn’t dramatically different from most of what gets built today.