This same unit of growth pattern can be seen in the spiral arms of our Universe. So to simplify things If we're built from Spirals while living in a giant Spiral, then its quite obvious that everything that is within is also infused with the Spiral.
Surely you mean our galaxy, yes? There are plenty of other non-spiral galaxies.
Other than that, welcome to EvC. I hope Slev didn't let a one hitter quitter in.....
"A still more glorious dawn awaits
Not a sunrise, but a galaxy rise
A morning filled with 400 billion suns
The rising of the milky way"
-Carl Sagan