Columns is a juggling trick where the balls are thrown upwards without any sideway motion. The simplest version involves having three balls, with two going up simultaneously on either side, followed by one going up in the middle. The effect of the trick is that the balls are not crossing at any point, so your hands have to move a lot quicker and further than in a regular pattern.
The trick can be extended to any number of balls (within reason!) and can be varied by doing synchronous or a-synchronous throws.
Columns may be exposed or hidden in walls; constructed of precast concrete, masonry, stone, or wood or of steel wide-flange, pipe, or tubular sections; they may be plain, fluted, or sculpted, with or without a capital and base.
Columns are frequently used to support beams or arches on which the upper parts of walls or ceilings rest.
The straight column under load is in stable equilibrium if a lateral force, applied between the two ends of the column, produces a small lateral deflection which disappears and the column returns to its straight form when the lateral force is removed.
While some jugglers focus primarily on numbers juggling (juggling as many objects at once as possible) and stick to the standard patterns (the cascade for odd numbers and the fountain for even numbers), far more jugglers are interested in learning many different tricks and patterns.
Jugglingcolumns (each prop has it's own vertical lane) while the arms continually cross and recross is called Mills Columns, or the Boston Mess.
While juggling 3 balls, one is always thrown under-the-arm by one hand and thrown from the outside ("over the top") with the other, so it loops around the rest of the pattern.