Very cool. Of course, 7 has been a lucky number! A quick Google reveals:
"Lucky 7" is the world’s favourite number. There are seven days of the week, seven colours of the rainbow, seven notes on a musical scale, seven seas and seven continents.
Snow White ran off to live with seven dwarves, there were seven brides for seven brothers, Shakespeare described the seven ages of man, Sinbad the Sailor had seven voyages. And when Ian Fleming was looking for a code for James Bond, he didn’t go for 006 or 008. Only 007 had the right ring!