In a society where food is scarce, people would be spending the whole amount of fluid at their disposal in the satisfying of their vital needs. A society where food is abundant would leave to its members almost all their fluid to be spent, once survival was assured.
If we follow the model described above, it is sound to start a sleep cycle having spent as much fluid as possible, but without having required more than was available. An individual that under-uses his daily fluid would tend to boredom and depression. One that over-uses it would end up worn-out.
If we decide that it is good for every human that he wouldn't have to spend a too great amount of his fluid on insuring the continuity of his existence, it becomes necessary to interest ourselves in the investment of the leftover fluid. If you think that, on the contrary, it should be made sure that all humans spend all their concentration into the satisfaction of their vital needs, I invite you to walk away before I lose patience and start throwing pointy objects at you.
I will try to avoid philosophising around. I'll try to stick to what "seems to be" and describe it. My intent is not to give you a goal in your life, rather to give you tools to play around with.
If ever, the leftover fluid must be spent on something that requires concentration. It can be "concentrating for the sake of concentrating". Some people do that in the form of meditation or heavy duty prayer. The feeling of relaxedness that comes from those exercises is induced by the big load of fluid it can shed in a short while. I don't use the word "waste" because it is meaningless here. It could be defined that all unit of fluid not used for survival is wasted but that leads to slippery slopes.
I don't consider "working" as a case here, since usually, work insures your survival. But it is true that, for all wages superior to a certain amount, only part of it is for survival and the rest is "leftover-investment". Because the money that it earns will be spent in tour vacations, compulsive consumption, unneeded jewellery and so on...
Hobbies can be defined as: "unimportant activity that one does to keep oneself occupied". This is clearly a way of spending the leftover fluid in order to sleep better at night. Some glue little airplanes into shape, some play computer games, some try to write philosophy with a scientific taste, some "go to see friends"... This last one in particular is interesting.
This theory puts on the same level "socializing" and "compulsive consuming": Unnecessary activities that humans do to shed some fluid. This example shows how this theory is an argument to no philosopher. It is a very neutral and functional tool that can help in giving an original perspective.
