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What have you learned?

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This chapter should have firmed up some of the ideas about objects and messages that were introduced in the previous chapter. Now you have learned about:

The Playground sample application
Creating new objects using a #new message
Creating a Playground window
Adding shapes to a Playground
Manipulating and querying Playground shapes
Using the Package Browser to install a new package into your Dolphin image

In subsequent chapters we will reuse the Playground application to illustrate some more features of the Smalltalk language. For now, tidy up by closing your existing Playground and workspace.