5 Ball Sandiplex - 〚3p3〛121
This is a side-by-side 5 ball multiplex pattern quite suitable for beginners. Both jugglers have the same throw sequence, but at different times and so each juggler does time-shifted mirror-image motions compared to the other juggler. This sounds more confusing than it is - in plainer words: you have to learn standing on either side separately, because now your left hand does what your right hand did in the other position and vice versa. And even while you have the same (mirrored) sequence you are not doing them at the same time, but alternate with the other juggler in throwing the pass.
Pattern Description

For an interactive animation, follow this link to jugglinglab.org
Link to passing.zone video: passing.zone, pattern starts at 7 seconds
As a siteswap:
A(2|1): [3p,3] 1 2 1 B(1|1): 2 1 [3p,3] 1
(TODO: verify starting positions of balls)
Translated into words:
A(2|2): [pass,self] zip hold zip B(1|2): hold zip [pass,self] zip
So here [pass,self] is the multiplex throw. The multiplex passes and selfs always go from the outside hand (furthest away from the other juggler) towards the two inside hands (next to the other juggler)
A zip means handing the ball from one hand to the other. This can also happen as a very fast horizontal throw with no real height.
A hold means that you would have time for a very small throw, but the throw is omitted and your hand just doesn't throw on that beat. In this pattern the hold is perceived as catching a ball, which makes the sequence:
A(2|2): [pass,self] zip catch zip B(1|2): catch zip [pass,self] zip