A Boulder sits upon the top of a hill.
And a Human Sees.
They could push the boulder south, or north, or east, or west down the hill.
And no matter which way they push the ball down the hill.
In retrospect it will always look like it could not have went any other direction.
So that the outcome is no different than from whether a human were to move the boulder, or a bolt of lightning were to knock the boulder off its place, and in the process we see the visage of a ghost moving the boulder, in perfect correlate to the strike. The outcome will always look the same in retrospect, determined by natural law, and preexisting conditions.
So that the causality of mind is as it were of a phantom, acting upon the world.