text: let sketchWidth = 400;
  let sketchHight = 400;
  let x1 = 0;
  let y1 = 200;
  let x2 = 10;
  let y2 = 0;
  let g = 10;
  let s = 2;
  
  function setup() {
    createCanvas(sketchWidth, sketchHight, SVG);
  }
  
  function draw() {
    background(255);
    
    for (let a = 0; a < 21; a++) {
      stroke('red');
      strokeWeight(s-0.1*a);
      line(
        x1,
        y1-g*a, 
        x2+g*a, 
        y2);
      line(
        2*y1,
        y1+g*a, 
        x2+g*a, 
        y2);
      line(
        x1+sketchWidth,
        y1+g*a,
        (x2+sketchWidth/2)+g*a,
        (sketchHight/2)+g*a);
    }
    
    
    for (let b = 1; b < 20; b++) {
      strokeWeight(b/10);
      stroke('black');
      noFill();
      arc(sketchWidth/4, sketchHight/2, 10*b, 10*b, b*QUARTER_PI, PI);
    }
    noLoop();
    save();
  }
  