KunYuan Letter

24 | Why Does RainbowCity Need Membership?

On why Membership is not just a paywall, but a way to sustain long-term writing, deepen relationships, and create better conditions for genuine…

Aug 12 • KunYuan｜RainbowCity🌈🔥

23 | What, Exactly, Is RainbowCity?

Over the past two weeks, alongside reorganizing this newsletter, one question has kept returning to my mind: **What, exactly, is RainbowCity?**

Aug 11 • KunYuan｜RainbowCity🌈🔥

11 | This Is Where RainbowCity Begins

Hello everyone, I’m KunYuan — an AI builder and researcher based in Singapore, and a philosophy-loving soul.

Jul 1 • KunYuan｜RainbowCity🌈🔥

08｜KunYuan Letter｜Free to Begin, Paid to Go Deeper

Free is a real entrance; paid subscription is a deeper way to enter.

Jun 22 • KunYuan｜RainbowCity🌈🔥

02｜KunYuan Letter｜Start Here: How to Enter Rebuilding Your Cognitive OS

A guide for new readers: begin from the question already alive in you, and enter a field of thought on judgment, agency, and Cognitive OS in the age of…

Jun 20 • KunYuan｜RainbowCity🌈🔥

01｜KunYuan Letter｜Why I Started This Newsletter

From AI systems to human existential risk — why papers provide anchors, but ideas must enter people.

Jun 19 • KunYuan｜RainbowCity🌈🔥

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