void mainImage(out vec4 fragColor, in vec2 fragCoord)
{
    vec2 uv = fragCoord.xy / iResolution.xy;

    vec2 p = uv * 2.0 - 1.0;

    p.x *= iResolution.x / iResolution.y;

    float t = iTime * 0.4;

    vec3 color = vec3(0.0);

    for(int i = 0; i < 9; i++)
    {
        p = abs(p) / clamp(dot(p, p), 0.2, 2.0)
            - 0.8;

        p += vec2(
            sin(t + float(i)),
            cos(t - float(i))
        ) * 0.05;

        float d = length(p);

        color += vec3(
            sin(float(i) * 0.7 + t),
            cos(float(i) * 0.5),
            1.0
        ) * exp(-d * 2.5);
    }

    fragColor = vec4(color, 1.0);
}