Macroscope by Piers Anthony. 

Reads like a somewhat trashy but engaging sci-fi but basically presages everything that's happened in 40 years since it was written (in a deep way, not as in "there will be an internet and flying cars" but as in "there will be waves of change which will look like bad things but will actually be good because they drive human adaptation"). 


Diceman by Luke Rhinehart

Again seems a bit superficial but actually leaving decisionmaking to chance is totally mindblowing - illuminates what you are doing, or think you're doing, when you're taking decisions yourselves - and so illuminates what you are, really.