text: let click = false;
  function setup() {
    createCanvas(500,500);
    
  }
  
  function draw(){
    backlines();
  }
  function backlines(){
    
    if (click) {
      clear();
     strokeWeight(1);
     stroke(0, 0, 160);
     for (let i = 0; i<185; i+=15) {
        line(i, 0, 500-i, 500);
        line(500-i, 0, i, 500);
        }
        for (let i = 15; i<485; i+=15) {
          line(0, i, 500, 500-i);
        }
      rlines();
      }
    else{
      clear();
      rlines();
    }
    
  }
  function rlines(){
    strokeWeight(2);
    stroke(160, 0, 0);
    line(210, 0, 210, 500);
    line(290, 0, 290, 500);
    
  }
  
  function mouseClicked() {
    if (click) {
      click = false;
    } else {
      click = true;
    }
  }
  