void OnTriggerEnter(Collider other)
    {
        if (other.TryGetComponent <Rigidbody>(out Rigidbody rb))
        {
            body             = rb;
            body.isKinematic = true;

            attractor.ActOn(body.transform);
            rotator.ActOn(body.transform);

            attractor.enabled = true;
            rotator.enabled   = true;
        }
    }