constructor(){

    this.x = width/2;

    this.y = height/2;

  }

  display(){

    stroke(0);

    point(this.x, this.y);

  }

  step(){

    let stepx = random(-1, 1)

    let stepy = random(-1, 1)

    this.x += stepx;

    this.y += stepy;

  }

}