public static Selectable TargetForMoveDir(this Navigation navigation, MoveDirection direction)
 {
     return(direction.Map(MoveDirection.Up, navigation.selectOnUp)
            .Map(MoveDirection.Right, navigation.selectOnRight)
            .Map(MoveDirection.Down, navigation.selectOnDown)
            .Map(MoveDirection.Left, navigation.selectOnLeft));
 }