Real life situations, real life struggles birthed out of the exercise of choice (yours and others) real life pain, real life trouble, real life scapegoating instead of owning up, etc etc etc...all created out of real life longing and real life emptiness that is the product of having been told to look for real life where it does not exist.
It's just interesting, this human activity of always thinking real life is out there somewhere or up ahead when in reality we already have all we need. We are already rich. It's all the time spent out there looking for something we already have that leaves us paupers.
When your thought world has been shrunken and tamed by the prevailing systems of the outer world and now can only play there within that soul diminishing world...you are left trying to squeeze life from something that has no life to give.