It's useful to remember that ERE2 stands for Emergent Renaissance Ecology. This means something literal.
Perhaps the initial confusion comes from not understanding what "emergence" really entails? It's not just a buzzword.
Lets say someone had invented a game called
keepie-uppie that required juggling a football and keeping it in the air for as long as possible. Lets say that people begin to practice this on the internet sharing youtube videos of their various tricks and techniques. And lets also say that someone organizes this into a curriculum of which tricks are easiest to learn first and which tricks one must master to do combinations.
However, despite being a novel and obscure game that is only practiced by a few people who rarely meet, keepie-uppie is developed to a high level as people are able to practice on their own in their own backyards. Some can keep the ball in the air for hours using all parts of the body except the arms of course.
Twenty years pass and keepie-uppie is becoming popular.
(ERE1 is currently somewhere between the previous sentence and the next sentence.)
Keepie-uppie players meet in regularly in parks each bringing their own ball and keeping it up for hours.
Then suddenly something weird happens. One ball flies loose, but another player catches it and keeps it up. Soon keepie-uppie players are passing balls between each other in one giant juggling act. A new game has emerged.
It doesn't take long before a variant is invented where the aim is to steal the ball from another player. This is tricky, so in a feat of momentuous inspiration, it is deigned worthwhile to relax the holy rule of never letting the ball touch the ground. Some complain about changing the game too much but after seeing the new rule working people quickly get over it as the newest game is much more exciting. However, there's a tendency for faster players to simply run away with the ball. Various things are attempted to resolve the situation.
Some day it occurs to the players that if they had a goal (like a flag in capture the flag), the "run away"-strategy would always return towards the goal.
Soccer has emerged or rather been developed by borrowing some concepts from other games. It was a good thing that at least one of the keepie-uppie players was also doing other sports!
As soccer gets standardized, it gets more exciting to play. It gets so exciting that it's fun to even just watch. This results in stadium being built, which in turn begets tournaments. And eventually the world cup.
Now, I'm not sure this is how soccer was actually invented, but it illustrates emergence.
There was basically no way for a keppie-uppie player to ever become a soccer player without meeting with other keppie-uppie players and coming up with a new game called soccer. As a result, keppie-uppie players learned new skills like passing, dribbling, and bending-like-Beckham that made no sense within the game of keppie-uppie.
This is what emergence is.
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Renaissance is easy. We all know what a renaissance person is (ERE1)---it is someone who is competent in a wide array of fields and able to combine ideas from different fields in a transdisciplinary way. But what is a renaissance group like? What's a renaissance business like? A renaissance community? A renaissance society? We don't really know. These constructs have not emerged yet, but they will eventually.
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Ecology is also easy. Ecology essentially deals with the relations between [different] organisms and their relations to the surrounding environment. A soccer game is a kind of ecology with different species, like goalies, strikers, midfielders, defense, referees, ... On a bigger scale, it involves audiences, stadiums, ... and franchises. And all these "species" relate to the environment of other players, turfs, etc. in different ways.
A robust ecology is rarely a monoculture of conformity. In fact conformity is stagnant. Stagnancy is suboptimal in the quickly changing environment of the 21st century. A soccer team made exclusively of defenders would also be boring indeed. When new species are added, more types of interactions become possible and interesting things happens. The audience might start singing soccer-songs. Invention happens at the edges when new environments are added, when the environment changes, or simply when the density of a species change.
Ecologies also provide scaffolding. Keepie-uppie is pretty difficult compared to soccer which is simpler to play. Soccer allows many more people to participate if nothing else passively (or semi-aggressively) in the audience. However, soccer would never be possible if the expert keepie-uppie players hadn't gotten together (essentially forming a progenitor ecology) and created the emergent game in the first place.
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And so this is basically what ERE2 is and what it is trying to do.
There's no "definition" and no "true scotsman tests". Asking for a definition is like asking the keepie-uppie players in the park who just recently figured out they could pass the ball to each other for a "definition" of soccer. No clue! We're still figuring it out. However, we're not completely blind either. We know that whatever we come up with will involve a ball and some kicking ... and probably the head too. So we're testing out what might work and what might not work.
To do so we've borrowed some terms from other games (bounce, spin, lines, header, knuckleball, ...). You certainly don't need to know them to learn keepie-uppie, but knowing them has made us better at our keepie-uppie game, so it's hard just to shut up about them or explain the tricks using the older and simpler terms.
But why even be interested in all this, jacob? Sticking with ERE1 is fine for me! In fact, I wanted ERE1 because I wanted to do my own thing which didn't fit in with corporate/career-life. And now you want me to fit into some new thing?! Sorry, that's not for me.
I have no problem with that. All I can say is that after 10+ years of ERE1 and doing my own thing, I have effectively done every single ERE1 activity an individual can in the current environment---sports, travel, new career, business, non-profit, volunteering, garden, woodworking, ...---and I eventually reached a point of diminishing returns.
What remains is to see a) what ERE1 individuals can do when they play together; and b) what may appear in the environment when that happens.
I can completely understand if people aren't interested or don't see the value of ERE2. These ideas weren't on my radar 5 years ago.