DeepMind's Geoffrey Irving draws Mandelbrot in pure Lean via Claude, reflects on halting AI progress

DKokotajlo · x · 2026-10-16

DeepMind's Geoffrey Irving had Claude render Mandelbrot set figures in pure Lean — no Python, using the public-domain Hershey stroke font for text. He uses the exercise to reflect: Mandelbrot fiddling is 99.99% useless fun, but it's worth reflecting on the sense of loss relative to what humanity could explore if we stopped AI progress now and worked with current (slightly rewound) models.

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