human
Solve the following python programming problem given the following code:
def connectSkyboxCamera(view, debug = False) : 
    baseRen = view.backgroundRenderer () 
    def updateSkyboxCamera(o, e) : 
        c = baseRen.GetActiveCamera () 
        c2 = view.camera () 
        viewDirection = (np.array (c2.GetFocalPoint ()) - np.array (c2.GetPosition ())) 
        viewDirection /= np.linalg.norm (viewDirection) 
        if debug : 
            c.SetPosition (c2.GetPosition ()) 
            c.SetFocalPoint (c2.GetFocalPoint ()) 
else : 
            c.SetPosition (0, 0, 0) 
            c.SetFocalPoint (viewDirection) 
c.SetViewUp (c2.GetViewUp ()) 
        c.SetViewAngle (c2.GetViewAngle ()) 
view.renderWindow ().AddObserver ('StartEvent', <MASK>) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def updateSkyboxCamera(