The clock's methodical ticking helped bring into being the scientific mind and the scientific man. But it also took something away. As the late MIT computer scientist Joseph Weizenbaum observed in his 1976 book, Computer Power and Human Reason: From Judgment to Calculation , the conception of the world that emerged from the widespread use of timekeeping instruments "remains an impoverished version of the older one, for it rests on a rejection of those direct experiences that formed the basis for, and indeed constituted, the old reality." In deciding when to eat, to work, to sleep, to rise, we stopped listening to our senses and started obeying the clock.
What Nozick understands by compensation is anything that makes A indifferent (that is, A has to be just as good in his own judgement before the transgression and after the compensation) provided that A has taken reasonable precautions to avoid the situation.  He argues that compensation isn't enough, because some people will violate these boundaries, for example, without revealing his identity.  Therefore, some extra cost has to be imposed on those who violate someone else's rights. (For the sake of simplicity this discussion on deterrence is summarized in another section of this article).