This is a quartic (degree 4) "Rudy set" Mandelbrot-style fractal. The "heffalump" is the e lumpy, elephant-like shape we pass, standing on the little cloud-castle plateau. Formally, the quartic Rudy set is {k:Jkkkk is connected}, where Jkkkk is the Julia set based on a fomula similar to z^5 + k*z^3 + k*z^2 + k*z + k. See Rudy Rucker's page www.tinyurl.com/rudyfractals for details.
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