SOTS,
In some cases, the analogies while helpful in explaining the point made by the poster also illustrate the problem, as shown in e.g. responses #1, #2, #9, #20 to the opening post.
Some here do not want to acknowledge the external contribution to the gain of a system because it supposedly creates an infinite regression. One attempt to get round the problem is to try and claim that any gain is actually an increase and can therefore come from within the system (extrapolating from examples where an increase can come from within the system, e.g. the example with rivers in #112). The analogies used all have the cause of the gain being external, e.g. the opening post on this thread and the SIMS example in bluehillside’s #106.
Nope, nope, nopedy nope. That’s a “nope” with a thin marzipan layer, fondant icing and marrons glacés on top.
Sometimes new “information” can be introduced – sunlight is an obvious example – but the basic phenomenon of emergence requires no such thing. Provided some core principles are followed (paying attention to your neighbour for example) then remarkable levels of complexity will arise when none of that data exists in the component parts,
and when there’s no fresh input of data from an eternal source.
Emergence is simply higher-order complexity arising out of chaos in which novel and coherent structures have coalesced from the
interactions between the diverse components of a system. In colloquial terms, the whole is greater than the sum of its parts.
It’s these interactions (and
not an injection of fresh data) that disrupt and so cause the system to differentiate and then to coalesce into something novel. Some Steven Johnson for you again:
“Agents residing on one scale start producing behaviour that lies one scale above them: ants create colonies; urbanites create neighbourhoods; simple pattern-recognition software learns how to recommend new books.”
The point is that there’s no-one in charge, and that simple rules rigorously applied engender complex behaviour.
If you want to know how it works, essentially emergence relies on feedback among neighbouring agents, and on clustering as like finds like.
Anyways, it’s a fascinating subject in its own right. I don’t blame you for looking askance at first sight either – it feels pretty counter-intuitive to begin with – but when you come to understand it it’s a powerful model for all the reality we perceive – even forces and mass being emergent properties of an underlying field of
information whose ripples we perceive as elephants and umbrellas and skyscrapers. And indeed as “we”.
Try Stephen Johnson’s “Emergence” as a primer to get you started – it’s an engaging read as well as an informative one.