●Why is(71)fun、 What delights may its practitioner espect his reward、 First is thesheer joy of making things.As the child delights in his mud pie,so the adult enjoysbuilding things,especially things of his own design.Secong is the pleasure of makingthings that are useful to other people.Third is the fascinanon of fashioning complexpuzzle-like objects  of interlocking moving  parts and watching them  work in subtleeyeles,playing out the consequences of principies built in from the beginning.Fourthis the joy of always learning,which springs from the(72)nature of the task.In one wayor    another    the    problem    is    ever    new,and    its    solver    learnssomething:sometimes(73),sometimes  theoretical,and  sometimes both.Finally,there  isthe delight of working in such a tractable medium.The(74),like the poet,works onlyslightly removed from nure thought-stuff.Few media of ereation are so flexible,so easyto polish and rework,so readily capable of realizing grand conceptual structures.Yet the program(75),unlike the poet’s words,is real in the sense that it moves andworks,producing  visible  outputs  separate  from  the  comstrct  itself.It  printsresults,draws pictures,produces sounds,moves arms.Progamming then is fun because itgratifies creative longings built deep within us and delights sensibities we hav e incommon with all men.