Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Object Lisp was an object-oriented extension for Lisp Machine Lisp designed by Lisp Machines, Inc. Object Lisp is an early example of Prototype-based programming. It was seen as a competitor to other object-oriented extensions to Lisp at around the same time such as Flavors, in use by Symbolics, Common Objects developed by Hewlett-Packard, and CommonLoops, in use by Xerox. Object Lisp was also used in early versions of Macintosh Common Lisp. There the user interface toolkit was written using Object Lisp.

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