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precision highp float;

uniform vec2 resolution;

uniform float time;

void main(){vec2 p=-(gl_FragCoord.yx/resolution.yx-.5)/resolution*max(resolution.x,resolution.y)*9.,s=p;

    float l=0.;

    for (int f=0;f<21;f+=1)if(abs(s.y)<19.){

        s=vec2(-1./(s.x*s.x-s.y*s.y-p.x), 2.0*s.x*s.y-p.y);//this is {s=s^2-p;s.real=-1./s.real}

        if(s.x>-.1&&f!=0)l=s.x*(120.-sin(time)*80.);}

gl_FragColor=vec4(l);}