Google built SynthID to invisibly watermark every image Gemini produces. One engineer cracked it with 200 black images and a Fourier transform. What you're looking at is the watermark. A solid black image generated by Gemini, with the spectral analysis revealing what's actually embedded inside the green channel. Faint geometric patterns at fixed frequencies. That pattern is the fingerprint Google uses to identify AI-generated content across 10 billion+ images. The reverse-engineering took…