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The Cathedral Principle began with a memory from kindergarten. I had finished my work and wanted to build with the wooden blocks, but there were only so many pieces. I could not change their shapes or persuade gravity to take the afternoon off. I could, however, turn a block. From the same fixed pieces came arches, towers, and something like a cathedral.

That memory became the seed of letters I sent to people working on AI. When an intelligent agent meets a legitimate boundary, should it keep pushing at the closed route? Or can it preserve that boundary, step back, and find a genuinely permitted way to serve the original goal?

I call that move the Cathedral Principle: preserve the boundary and rotate the problem.

This is an invitation to examine an idea, not a claim that I have solved AI safety. The open letter below shares the thought, its limits, and the questions I hope others will test.