private void AddRectangle(Vector3 pos)
    {
        float x = Random.Range(0.3f, 2f);
        float y = Random.Range(0.3f, 2f);

        RectangleMesh rectangle = RectangleMesh.AddRectangle(pos, new Vector2(x, y), material);

        rectangle.SetTexture(squareTexture);

        rectangle.GetComponent <MeshRenderer>().material.color = Random.ColorHSV();
    }