As we mentioned in Curve Detectors, our first investigation into curve neurons, it’s hard to separate author contributions between different papers in the Circuits project. The earliest understandings of how curve neurons are built from lines and edges came from Chris, and the details came from further investigation by Nick. Nick studied through neuron families in the early layers, studying how shape neurons incrementally incorporate increasingly sophisticated texture and cosmetic neurons, working towards the neuron families diagram in the first section.