float noiseVal;
float noiseScale=0.02;

void loop() {
  for(int y=0; y<height; y++) {
    for(int x=0; x<width/2; x++) {
      noiseDetail(3,0.5);
      noiseVal=noise((mouseX+x)*noiseScale, (mouseY+y)*noiseScale);
      stroke(noiseVal*255);
      point(x,y);
      noiseDetail(8,0.65);
      noiseVal=noise((mouseX+x+width/2)*noiseScale, (mouseY+y)*noiseScale);
      stroke(noiseVal*255);
      point(x+width/2,y);
    }
  }
}