Apple-bobbing

Choosing is paradoxical. In the nature of the case, choices are future-oriented. It's too late to make choices about the past. So we deliberate and decide with a view to the future.

However, our actions in striving to achieve the goal impact the very future we aim for. We're reaching for a goal, yet the act of reaching for the goal disturbs the goal. Like apple-bobbing, where the very effort to pick an apple pushes the apple way.  

So the future becomes a moving target. By perturbing the future, the future we end up with isn't the same future we began with.