#define PI 3.141592
#define LINES 12.

mat2 rotate(float a) {
  return mat2(cos(a), -sin(a), sin(a), cos(a));
}

void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
  vec2 uv = (2. * fragCoord - iResolution.xy) / iResolution.y;
  uv /= vec2(1.1 * dot(uv, .01 * uv));
  for (float i = 0.; i < LINES; i++) {
    uv *= rotate(iTime / 20.);
    float x = 8.79 * sin(.01 * uv.x - iTime) * uv.y * 2.1;
    float y = length(.1 * log(abs(uv)));
    vec2 p = vec2(x, y);
    vec3 col = cos(vec3(-2, 0, -1) * PI * 2. / 3. + PI * i * iTime / 10. + i / 70.) * 0.5 + 0.5;
    fragColor += vec4(21.264 / length(uv - p * 0.9) * col, 2.45);
  }
  fragColor.xyz = pow((fragColor.xyz), vec3(2.45));
  fragColor.w = 1.0;
}