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===Connection to artificial intelligence===
Since inception, Lisp was closely connected with the [[artificial intelligence]] research community, especially on [[PDP-10]]<ref name="PYuEL">The 36-bit word size of the [[PDP-6]]/[[PDP-10]] was influenced by the usefulness of having two Lisp 18-bit pointers in a single word. {{cite newsgroup |quote=The PDP-6 project started in early 1963, as a 24-bit machine. It grew to 36 bits for LISP, a design goal. |url=http://groups.google.com/group/alt.folklore.computers/browse_thread/thread/6e5602ce733d0ec/17597705ae289112 |title=The History of TOPS or Life in the Fast ACs |newsgroup=alt.folklore.computers |message-id=84950@tut.cis.ohio-state.edu |date=18 October 1990 |author=Peter J. Hurley}}</ref> systems. Lisp was used as the implementation of the language [[Planner (programming language)|Micro Planner]], which was used in the famous AI system [[SHRDLU]]. In the 1970s, as AI research spawned commercial offshoots, the performance of existing Lisp systems became a growing issue, as programmers needed to be familiar with the performance ramifications of the various techniques and choices involved in the implementation of Lisp.<ref>{{Citation |last1=Steele |first1=Guy L. |title=The evolution of Lisp |date=January 1996 |url=http://dl.acm.org/doi/10.1145/234286.1057818 |work=History of programming languages---II |pages=233–330 |editor-last=Bergin |editor-first=Thomas J. |place=New York, NY, US |publisher=ACM |language=en |doi=10.1145/234286.1057818 |isbn=978-0-201-89502-5 |access-date=2022-07-25 |last2=Gabriel |first2=Richard P. |editor2-last=Gibson |editor2-first=Richard G.|url-access=subscription }}</ref>
===Genealogy and variants===
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