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816: Mainline 
 

Next, you create a Food instance:

Workspace
F := Food new. 




Then, you create an aspect adapter, which you specialize with several 
messages.  The subject: message connects the aspect adapter to the 
Food instance.  The forAspect: message, with the 
#fCalories argument, stipulates that the fCalories variable, 
accessed by fCalories and fCalories:, is the variable of 
interest.  The subjectSendsUpdates: message, with the true 
argument, stipulates that the aspect adapter is to expect the 
fCalories: message to generate changed: messages, which 
lead to the sending of update: messages, which the aspect adapter must 
forward to all viewers.

Workspace
A := (AspectAdaptor new) subject: F; 
                         subjectSendsUpdates: true; 
                         forAspect: #fCalories