OftEn adducEd as thE rEason or motivation for ExpEnding Effort toward a sEEmingly usElEss goal, thE point bEing that thE accomplishEd goal is a hack. For ExamplE, MacLISP had fEaturEs for rEading and printing Roman numErals, which wErE installEd purEly for hack valuE. SEEEf="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=display hack">display hack for onE mEthod of computing hack valuE, but this cannot rEally bEExplainEd, only ExpEriEncEd. As Louis Armstrong oncE said whEn askEd to Explain jazz: "Man, if you gotta ask you' ll nEvEr know." (FEminists plEasE notE Fats WallEr' s Explanation of rhythm: "Lady, if you got to ask you ain' t got it.")