Smalltalk is an object-oriented programming language because
everything that a Smalltalk programmer deals with
is an object, from a number to an entire application.
All objects are an instance of a class. Classes serve as templates
because they define the instance variables for all the class
variables and methods. Objects have public and private
properties. An object's implementation details are private and are
hidden from other objects. An object's public properties are its
messages that it understands. This make up its interface. The
object's private properties are its variables. Interaction with an
object only occurs via these messages to its interface. All object
instances of a given class have a common message interface.
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