now i think people chose 7 is because
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送交者: meiyou 于 2007-09-21, 10:19:59:
回答: 7 is a number that is assigned least cultural/visual significance 由 meiyou 于 2007-09-21, 10:11:54:
you tend to use a small number - smaller, simpler, easier ... so you won't start from the 11 downwards. you start with 6, but you want to make it safe (so it is definitely greater than 5) then you bump one more and reached 7.
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