Turbo mode!
x(n+1) = 1+u(x(n) cos t(n) - y(n) sin t(n)) y(n+1) = u(x(n) sin t(n) + y(n) cos t(n)) t(n) = 0.4 - 6/(1 + x(n)^2 + y(n)^2) u = 0.9 https://en.wikipedia.org/wiki/Ikeda_map
