[Pharo-project] Understanding Morphic programming

Hello list: I've read *"Squeak by Example"* and looked at some Morphic tutorials and example Morphs. I still don't understand how to organize my code with Morphic, =( 1) How should I separate the model from the graphical representation? Object subclass: #Person instanceVariableNames: 'name address email' Morph sublcass: #PersonMorph instanceVariableNames: 'person' The morph can then show and update the model when changed. 2) What happens if the model is changed by another class. How does the morph gets notified? What is the preferred approach? Thanks in advance!