let offset = 0;

let x1; let y1;

let x2; let y2;

let x3; let y3;

let x4; let y4;

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

//   background(220);

  strokeWeight(0.5);

  stroke(0, 100);

  noFill();

  x1 = noise(offset+5)*width;

  x2 = noise(offset+10)*width;

  x3 = noise(offset+15)*width;

  x4 = noise(offset+20)*width;

  y1 = noise(offset+25)*height;

  y2 = noise(offset+30)*height;

  y3 = noise(offset+35)*height;

  y4 = noise(offset+40)*height;

  offset += 0.01;

  bezier(x1, y1, x2, y2, x3, y3, x4, y4);

}