Technical data for this type of fractal : click here.

For the curious fractal here :
fn1 = tan(), fn2 = sqr(), fn3 = tan(), fn4 = asinh()
real(p1) = 3, imag(p1) = 100, real(p2) = -10, imag(p2) = 4, real(p3) = 3.5, imag(p3) = -9