x^2 + y^2 + z^2 < (cos(12 * x) + cos(12 * y) + cos(12 * z)) / 6.0 + 0.6 ||
x^2 + y^2 + z^2 < (sin(12 * x) + sin(12 * y) + sin(12 * z)) / 6.0 + 0.6