https://twitter.com/zozuar/status/1443012484189888515

float i,e,f,s,g,k=.01;for(o++;i++<1e2;g+=min(f,max(.03,e)).3){s=2.;vec3 p=vec3((FC.xy-r/s)/r.yg,g-s);p.yz*=rotate2D(-.8);p.z+=t;for(e=f=p.y;s<2e2;s/=.6)p.xz*=rotate2D(s),e+=abs(dot(sin(ps)/s,p-p+.4)),f+=abs(dot(sin(p.xzs*.6)/s,r/r));o+=(f>kk?e:-exp(-ff))ok;} // https://bit.ly/2Y62OUg