tl;dr: A macOS desktop toy that renders a 3D fruit fly driven by a live 1 kHz leaky-integrate-and-fire simulation of a 668-neuron circuit with ~19,000 real synaptic connections from the FlyWire connectome (FAFB v783). Cursor motion feeds real LC4/LPLC2 looming detectors, and escape only triggers when the Giant Fiber actually spikes — no scripted behaviors. Includes an interactive brain window showing 23,210 neuron soma positions where you can "optogenetically" stimulate regions and watch the fly groom, walk, steer, or flee accordingly.