@property (copy) NSArray *children;
@property (weak) id base;
@property (copy) NSString *name;
@property (assign) BOOL active;
@property (readonly) float magnitude;
@property (copy) NSArray *children;
@property (weak) id base;
@property (copy) NSString *name;
@property (assign) BOOL active;
@property (readonly) float magnitude;