I've found that the experience of walking in a contemporary building feels categorically different from stepping in a building from before the 20th century. Perhaps it's because the role of an architect has become increasingly separated from the physical building itself — buildings are often designed by people who don't spend time in the buildings they construct, perhaps planned on a wholly different continent. Maybe it is a long-developed aesthetic manifestation of 17th century rationalist thought, interested in the functional mechanisms of detached parts, in each nook and cranny of modern life. Whatever the reason, contemporary architecture often feels more like a generic concept of a place, imagined with pencil and paper, rather than a place that was built for specific needs, time, and place. Sure, a contemporary penthouse is cleaner and more streamlined than a medieval hovel, but many people feel that popular 20th century architecture lacks the warmth of previous eras, even veering on the uncanny.
Many people feel this way, but it appears that our vocabulary for analyzing architecture has largely been whittled down to purely utilitarian claims like cost, efficiency, and prestige. If you say that a city hall with the form of a concrete industrial turret is any "worse" than a city hall made of polished pillars supporting an intricately carved dome that appears to lift itself to the celestial sphere — on what grounds can you say that?* Isn't that just your personal vibe?
When you don't have language to express this discomfort, critiquing modern architecture may just seem rude, pretentious, or uncultured. Yet, we can observe what kind of architecture people spend thousands of dollars to visit, or the building they use as the backgrounds for their wedding pictures. Notre Dame, the Taj Mahal, and the Forbidden City contain a magnetic, enduring beauty that seems less common with contemporary architecture.
To understand the quality of a given building, Christopher Alexander proposes a humble question — does a building have life?
Now, what does that mean? Alexander can't be referring to purely biological processes, because physical buildings contain few. Instead, he refers to "life" as a subjective feeling of wholeness, experienced when a space feels livable and harmonized with its surroundings. It encompasses something like the freedom for healthy activities to take place within a particular space.
Here's an example he uses: think of a house with a window to an open, inviting field where a mother can watch her children play while carrying out her personal tasks. This gives her the freedom to have some free time to spend on her own tasks indoors, while keeping on eye on the kids in a way that doesn't take up too much mental bandwidth. The kids are in a place that's not only safe, but good for running around (as opposed to say, the kitchen with a glass-doored cabinet of fine china). Compare this to say, living on the 10th floor of an apartment complex, in which she can either watch her children play outside, or perform her personal tasks, but not both simultaneously.
Another example would be a floor design in which there are different rooms for different types of activities, in which an individual can choose differing levels of privacy. These rooms also connect in cohesive ways, such that the most public areas are the first to access, and they connect to rooms that with related activities. Compare this to an open floor plan in which everything happens in one space, and only one type of public social organization can take place, rather than providing different scales of rooms for different functions.
Christopher also applies this concept more subtly to geometric patterns in rugs, in which some patterns, through interconnecting shapes, repeated motifs, or elegant boundaries appear to make us feel more "alive" than looking at flat, weird, and incongruous patterns.
It gets kind of mystical, which is maybe what architecture needs. It's kind of hard to explain without listing a variety of examples, which Alexander does well. If you read this book, you can't go into it with the expectation for "beauty" and "good form" to be laid out like the building instructions of an IKEA bookshelf. In that sense, it reads more like a set of allegories than a how-to guide. But that expectation of rigid, explicit mechanism is Alexander's main critique of 20th century architecture. He believes that understanding the relationship of function and beauty is not something that can be understood hypothetically without application to a particular context, or without consulting the inner emotion of the architect. "The feeling of life within a space" is something that an architect should train, not unlike a meditator who reaches states that are someone ineffable from an outside perspective.
Though Alexander uses this mystical tone, he attempts to take concepts that are more intuitive and make them empirical. For example, to justify some of his principles, Alexander interviews his students about how much "life" in contained in a particular building has and records the results. He may claim that because a traditional Japanese tea table received more votes than a Bauhaus chair, the concept of life is proven on an empirical basis. I think I see the reason why he would appeal to empiricism for credulity, but I don't know if this really works. It seems like he simultaneously critiques the contemporary approach to aesthetics for relying too heavily on quantitative metrics, and then uses a similar approach to prove his principles of architecture. I mention this because empiricism is less than 1,000 years old, but smart, sturdy, exquisite architecture is thousands, if not tens of thousands of years old. I'm not sure if Alexander's theory really needs empiricism in the same way that physics, chemistry, or astronomy are dependent on empiricism.
Regardless, I get this sense reading the book that even if you don't agree with his theoretical approach, he is onto something palpable. The book feels like a breath of fresh air — beautiful buildings are identifiable, feasible, and we can point to principles that can create then. His fifteen fundamental properties of good design gave me a lot to think about, and they were helpful to put into words why the design of some buildings work and some don't. Whether you agree with his explanation, if you can see that he recognizes a type of beauty that is often not given attention in architecture, then it's not too unlikely that he's found a clever way to get there.
* Referring to Boston City Hall vs. San Francisco City Hall