Luke is Vlogging: How many balls in a juggling pattern?

Juliane spotted a confusing image on Instagram and asked Luke to explain what is going on. Justin was wondering how many balls in a pattern, and also if it would be possible to juggle the pattern.

Justin’s Instagram post:

Day 16 of #100daysofjuggling I took my first cheat day yesterday, but still on track to hit 100 before grad school (9/6). Setting my sights on practicing 9 ball by crafting 'pure' siteswaps!

A post shared by Justin Warren (@jugglinjustin) on Jun 6, 2017 at 5:11pm PDT

Siteswap simulator in the video:
http://www.artofdiabolo.com/dsss/dsss.php