根据以下内容回答题：
“Too many people view their jobs as a five-day prison from which they are paroled every Friday，”says Joel Gook man，founder of The Humor Project，a humor-consulting group in Saratoga Springs，N．Y．Humor unlocks the’office prison because it lets s bring some of their childlike spirit to the job． According to Howard Polli0，professor of psychology at the University of Tennesse，Knox-ville，an office with humor breaks is an office with satisfied and productive employees．Pollio conducted a study that proved humor can help workers excel at routine production task．Employees perform．better when they have fun． In large corporations with a hierarchy of power，there is often no outlet for stress，“Every company needs underground ways of、poking fun at the organization，”says Lynn Mark，a speak-er on workplace humor for St．Mary’S Health Center in St．Louis． Kodak’S Rochester，New York branch discovered a way for its 20 000employees to uncork their bottomed-up resentments．Their 1 000．square．foot“Humor Room”features a“toy store．”Among the room"s many stress-reducing gadgets，the main attraction is a boss doll with Velcro antis and legs．Employees can dismantle the boss，as long as they put its arms and legs back in place． Every April Fool’S day，Sun Micro systems of mountain View，Calif．，concocts（虚构）an intricate hoax（恶作剧）aimed at one of its employees．One year，CEO Scott McNealy’S office was decorated as a one-hole，par—four miniature golf course．The annual gag does so much for encouraging teamwork and boosting morale that the company has set aside an April Fool’s hoax budget． Sandy Cohen，owner of a graphic print-production business，created“The Quote Board” to document the amusing phrases people say when under strict deadlines．“When you’re under stress，you say stupid things，”says Cohen．“Now we just look at each other and say，That’S one for the Quote Board!”
An office is compared to a five-day prison because__________ ．