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To move a market you have to move BIG POSITIONS one way or another. Who has the ability to move Big Positions? There are only so many big players, not only that but to go unnoticed they have to do it in small increments...the accumulation of those increments will not go unnoticed. The street might not know who is doing it, but it will not go unnoticed. That could move smaller players to follow a trend out of greed or abject fear.

On a technical basis a Player might think the market is getting a bit extended (up or down) and make a move in or out (fear and greed). The fellow next door is basically thinking the same thing..so he makes a move. Which creates a trend. Now if the Black Swan of a geo political or economic event occurs the whole herd might make a big move all at once...