Can anyone help me with this?

I was playing with the LED counter morph class, and trying to work out how 
it updated its screen display. I figured that 'self changed' was doing it, 
but when I did:

display dependents


in the workspace, the answer was an empty array. How can the change method 
work if the dependents list is empty?

More stuff (while I'm here):

I got into Smalltalk through my Open University course. There they made a 
big point of emphasising the distinction between the domain model and the 
UI, then later had to admit it wasn't always that simple - sometimes you 
need a little extra logic. Hence (I guess) MVC ...

.. but then where does Morphic fit in? To me it looks like this blurs all 
three back into one big ball again. I guess you would still model the 
problem seperately when appropriate, but it seems possible to build simple 
apps where the UI actually _is_ the model ...

Any comments?

Thanks

Daniel