Technical data for this type of fractal : click here (C01-01).

Here :
fn1() = sqr(), fn2() = ident(), fn3 = ident(), fn4 = acosh()
real(p1) = -4, imag(p1) = 4, real(p2) = -2, imag(p2) = 0, real(p3) = 2, imag(p3) = 0

If real(p1) = -2 instead of -4, the shape of the fractal looks like this :



If imag(p1) = 8 instead of 4, with no oter change, the shape of the fractal looks like this :



If imag(p1) = 128 instead of 8, with no oter change except the palette of colors, the shape of the fractal looks like this :