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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The challenge asked for the color to be set during initialization, and not as a method call. If you were to instantiate a Ghost object and continue to use the color method as you have written then it would generate a new random color each time.