Difficulty: 3 - Intermediate Trick
Siteswap: 4
Prerequisite Skills: 2-in-One-Hand, Columns, 4-Ball Fountain
Watch Video - WMV - 0.6 MB

Pistons is the 4-Ball Fountain juggled in columns. I find it the easiest of the 4-Ball Fountain variations, and it looks very good to spectators.
Instructions:
Practice 2-in-1 hand using column throws. Make sure you can do it with both hands.
Juggle Pistons just like you do the regular 4-Ball Fountain, just keep the throws in columns.