I created the spiral in After Effects from a single animated shape path, then built its neon appearance through layered compositing. Trim Paths draws the form over time while a moving gradient sends white-hot highlights through magenta and blue. Multiple blur scales, additive blending and motion blur create the luminous trail without sacrificing the definition of the core line.
I drew the vortex as a Bezier path on a shape layer and animated its End value with Trim Paths. A second offset stroke follows a few frames behind, which creates the sense of a moving head and prevents the trail from appearing all at once.
The visible line is a stack of passes: a narrow white core, a colored mid-width stroke and two broader blurred copies set to Add and Screen. This keeps the center crisp while the outer bloom expands naturally into the black background.
A magenta-to-blue gradient is animated along the path so the color travels with the highlight. Directional Blur, native motion blur and eased Trim Paths values concentrate energy at the leading edge and stretch the faster sections of the spiral.
For the exit, I faded the sharp core first and allowed the wide glow passes to linger. A blurred purple haze remains for a few extra frames, so the light appears to dissipate into the space rather than simply switching off.