var offset = 10;

var scalar = 1;

var speed = 0.005;

​

​

function setup() {

  createCanvas(400, 400);

​

}

​

function draw() {

  background(204,255,153);

  noFill();

  for(let i=290;i>=0;i=i-20){

    var x = offset + cos(angle) * scalar;

    var y = offset + sin(angle) * scalar;

    bezier(x+i,y+i,350,150,20+i,370+i,40,20);

    angle += speed;

    scalar += speed;    

  }

​

  for(let i=10;i<=width;i=i+20){

    var x1 = offset + cos(angle) * scalar;

    var y1 = offset + sin(angle) * scalar;

    bezier(350-i,20+i,350,150,x1+i,y1+i,360,20);

    angle -= speed;

    scalar -= speed;    

  }  

}