Well it's actually pretty simple.
SEVEN is generally considered to be a lucky number for gamblers . . . although if you break a mirror it is SEVEN years of bad luck.
Pythagoras called it the perfect number: three and four, the triangle and the square - the perfect figures.
Creationists believe that all things were created in six days and God rested on day SEVEN.
There are SEVEN lucky rings . . . each ring stands for something different:
life, love, longevity, friendship, health, wealth and happiness.
The moon changes it's phase approximately every SEVEN days.
Special powers are given to the SEVENTH son of the SEVENTH son.
In baseball, there is the SEVENTH inning stretch.
Remember Snow White and the SEVEN dwarfs?
There are SEVEN days in a week.
There are SEVEN deadly sins, SEVEN seas and SEVEN Wonders of the World.
A local phone number has SEVEN digits.
There were SEVEN ancient planets (Sun, Moon, Mercury, Venus, Jupiter, Mars and Saturn).
In Chinese culture, day SEVEN of the first moon of lunar new year is called "Humans Day", to be celebrated as the universal birthday of all human beings.
Ancient Japan was founded around SEVEN districts. In Japanese folklore their are SEVEN treasures and SEVEN deities.
In music, the diatonic scale has SEVEN pitches. There are five whole tones and two half tones.
But the REAL reason is . . .
On a sled dog team, you would have two wheel dogs, two swing dogs, two point dogs and a lead dog.
What more could anyone ask for?
