This is a Julia set plot who's "c" point is taken from the "seahorse valley" area of the baby Mandelbrot in the previous image, "Tendril baby Mandel."
This plot is zoomed in on the origin of the Julia plot, at a magnification of about 5.2E-4, which is about 1e5 larger than the magnification on the source Mandelbrot plot.
To recreate this plot, click here: Fractalworks plot 3 tendril baby mandel seahorse valley julia (centered)