About RainbowCity | Rebuilding Your Cognitive OS
A philosophy community where we practice not outsourcing judgment in the age of algorithms and AI
Hi, I’m KunYuan. Welcome to RainbowCity | Rebuilding Your Cognitive OS.
I’m an AI builder and researcher in Singapore, working on AI risk, AI safety, AI governance, and the question of human subjecthood in the age of algorithms and AI. I’m also the founder and chief researcher of TRANTOR LABS, a philosophy-first research lab focused on trustworthy AI, AGI-era infrastructure, and the conditions under which humans can continue to think, judge, take responsibility, participate in institutions, and make meaning.
Questions of memory, identity, action, responsibility, explanation, and auditability in long-running AI systems gradually pushed me back toward philosophy. They also made one thing increasingly clear to me: after the algorithmic internet spent years reshaping our attention, voice, relationships, and sense of time, AI is now moving further into the early stages of judgment — framing problems, organizing evidence, generating reasons, and setting priorities.
What Is RainbowCity?
RainbowCity is not a typical AI newsletter. It is not a channel for tool reviews, prompt hacks, AI news, or generic self-improvement. It is a philosophy community for the age of algorithms and AI, built for people who do not want to outsource their judgment.
Here, we use philosophy to name our anxieties, clarify concepts, and look beneath the smooth surface of increasingly frictionless systems. Through Cognitive OS practice, we bring philosophy into reading, writing, using AI, professional work, and real-life choices.
At the same time, we are building relationships that help people who refuse to outsource judgment find one another, practice together, and grow together. The aim is to preserve the intellectual friction that human subjecthood requires, and to gradually become a genuine community of thought.
When I speak of subjecthood, I do not mean simply “having a personality,” nor do I mean “doing whatever I want.” I mean a person’s continuing ability to engage with reality, evaluate evidence, form reasons, make choices, initiate action, and take responsibility for what they express and what follows from it.
These are the capacities RainbowCity wants to protect and train.
Why Philosophy?
We have more answers than ever, but not necessarily clearer judgment.
AI can generate reasons, organize material, compare options, and improve expression. But it cannot decide for us which questions are worth asking, which values deserve priority, or which responsibilities cannot be delegated. Nor can it bear the human consequences of what we put into the world.
Philosophy here is not intellectual decoration, nor is it an academic identity. It helps us do four things: name a vague unease, see the structure beneath a smooth surface, draw boundaries between concepts that are easily confused, and take back the weight of judgment and choice.
I want philosophy to come alive again in ordinary people’s reading, writing, work, conversations, and daily decisions.
What Is a Cognitive OS?
A Cognitive OS is not a productivity system, a prompt framework, or a knowledge-management template. It is the inner operating system through which a person forms judgment.
It has four closely connected processes:
Evaluation: What facts, sources, evidence, and counterexamples have I actually encountered?
Judgment: Have I formed my own reasons, or am I simply accepting a line of reasoning produced by the system?
Decision: How am I setting priorities, and what costs am I willing to bear?
Expression: Do these words and this position still belong to me? Am I willing to stand behind them?
RainbowCity is the community that holds the practice. Cognitive OS is the training path. Philosophy gives us language and boundaries; practice turns that language into concrete action; community ensures that no one has to train alone.
The Ten City-Building Essays
I number every essay I publish here so the pieces can refer back to one another and readers can see how the argument develops. With Essay 11, this newsletter officially became the RainbowCity philosophy community. Essays 12 through 21 will form RainbowCity’s public foundation. I call them The Ten City-Building Essays.
I hope every future reader and member of RainbowCity will take the time to read all ten. Together, they form the shared foundation for understanding this city — and, I hope, for understanding something about ourselves.
I am still writing the series. Two essays have been published so far, and the remaining eight will be released over the next two to three weeks. Once all ten are complete, I will officially open RainbowCity’s membership and begin the next phase of community life, building a city of thought grounded in philosophy where we can grow together.
Here is the full series:
Why Substack Feels Like a Post-Algorithmic Refuge (Published)
Notes Is Not Algorithm-Free. It Is a Different Algorithmic Order. (Published)
Why Our Souls Need Refuge After the Algorithmic Internet (Coming soon)
This Is Not Ordinary Anxiety. It Is Existential Anxiety. (Coming soon)
The Core of the Existential Crisis Is a Crisis of Subjecthood (Coming soon)
Why AI Deepens the Crisis of Subjecthood (Coming soon)
Why Philosophy Is the Antidote to Existential Anxiety (Coming soon)
What Is a Cognitive OS? Turning Philosophy into Practice (Coming soon)
How Long-Form Writing Helps Us Become People Who Judge for Ourselves Again (Coming soon)
Why RainbowCity Must Exist (Coming soon)
What I Will Continue to Write Here
RainbowCity’s long-term work is organized around three pillars:
Philosophy Stories (Free)
Through the lives and ideas of Socrates, Kant, Nietzsche, Sartre, Foucault, Arendt, and others, I will bring philosophy back into the questions we face today. The story is not the destination. It is a way to ask how we can continue becoming fully human in the age of algorithms and AI.
Philosophy in Practice (For members)
This is where Concept Engineering and Cognitive OS come together. We will bring philosophy into AI use, writing, research, education, entrepreneurship, management, organizational governance, and everyday judgment. It will not tell you what to think. It will help you form your own answers more clearly.
Research Bridge (Free)
This is where I connect the work of TRANTOR LABS — AI risk, AI safety, AI governance, ISA, MindOS, and research on civilizational risk — with real readers. Each essay begins with a human question and moves toward formal research, evidence, and the boundaries of governance.
I will also continue writing KunYuan Letters, City Essays, and Notes. As the community matures, I will gradually introduce Member Q&A, Monthly Reflections, Written Salons, and small reading circles.
Free Readers, Members, and Founding Builders
Free readers are also part of the RainbowCity community. The Ten City-Building Essays, public essays, Philosophy Stories, Research Bridge, KunYuan Letters, and public Notes will continue to form RainbowCity’s public square.
Becoming a RainbowCity Member is not about buying more articles. It means entering a more sustained philosophical practice: Philosophy in Practice, Member Q&A, Monthly Reflections, deeper concept work, exercises, and shared responses.
Becoming a Founding Builder is not about buying VIP status. Founding Builders are the people who help RainbowCity gain time, stability, and room to experiment in its earliest stage.
You can begin for free. If you want to enter a deeper practice, you are welcome to become a member. If you want to help this city stand firmly in its early days, you can choose to become a Founding Builder.
Once all Ten City-Building Essays have been published, we will officially begin the next phase of RainbowCity’s membership and community life. At that point, you will be able to join as a RainbowCity Member or a Founding Builder.
Welcome to RainbowCity
You do not need to understand philosophy before you arrive, and you do not need to oppose AI.
You may use AI deeply every day. You may come from writing, research, education, entrepreneurship, engineering, management, governance, or a completely different walk of life. What matters is that you still care whether your attention is your own, whether your judgment has passed through you, whether your voice grows from real experience, and whether your choices are understood and owned by you.
RainbowCity is for people who do not reject the future, but still want to judge for themselves who they are becoming.
I do not want to build a place where people escape the future. I want to build a place where people recover attention, judgment, voice, responsibility, and meaning — and become more capable of entering the future as subjects.
Welcome to RainbowCity.
