private async void Start()
    {
        _worldAnchorManager.IsMoving
        .Buffer(2, 1)
        .Subscribe(data =>
        {
            status.text = $"{data[0]} => {data[1]}";
        });

        await ARSessionManager.Instance.PowerOnAsync();

        // 最初にマーカー認識してからは認識頻度を落とす
        SubscribeFirstAction();

        // ボタン操作によるARSessionのリセット
        btn.OnClickAsObservable()
        .Subscribe(async _ =>
        {
            btn.interactable = false;
            var nextMode     = txt.text == "interval" ? "normal" : "interval";
            if (nextMode == "normal")
            {
                _disposable.Clear();
                _ctsIntervalTracking?.Cancel();

                if (SystemInfo.deviceModel.StartsWith("iPhone10"))
                {
                    await ARSessionManager.Instance.PowerOffAsync();
                    await ARSessionManager.Instance.PowerOnAsync(autoFocus: true);
                }
                else
                {
                    await ARSessionManager.Instance.ResetSessionAsync();
                }
            }
            else
            {
                _ctsIntervalTracking = new CancellationTokenSource();
                _disposable.Add(_worldAnchorManager.RegisterIntervalTracking(_ctsIntervalTracking));
            }

            txt.text         = nextMode;
            btn.interactable = true;
        }).AddTo(this);
    }