This image created with the
spectrum intercept algorithm
is based on the dynamical system characterized by the expression x''=a*cos(ω*t+φ)-b*x*|x|-μ*x',
where x'' is the second derivative of x with respect to time, t, and |x| is the absolute value of x.
The parameter values are a=7.5, ω=1, φ=0, b=1 and μ=0.1.