Selection by consequences (the main phenomenon of evolution/learning/mediation) follows a basic movement towards interoperability and interchangeability through modularity. As forms/structure proliferate (are selected for survivability) an ever progressive reduction to the simplest aspect of the structure providing the survivability function occurs. What is replicated within the generational line, the environment and the overall mesh of consequences is a generally modular structure - the signal separates and replicates from the noise.
That "life" on earth (and likely other planets) shares carbon as its elemental basis and proteins and cellular structures as replicating machinery is an example. Music and the arts are another example of a progression of signal differentiation until what is widely shared is almost pure signal. Music went from noisy localized and often private events to reproducible written scores to recorded and replayable sounds to studio produced to advertising jingle to 3-note musical logos to iconic ringtones to machine remixes and generative machine mixes. It is now almost pure signal and total self replication. Visual arts went through and are still going through this transformation from event to prints to xeroxes to Internet shared images to machine recompositions to computer vision and now googles deep dream and so on. Manufacturing, too, has gone from artisan craftspersonship to machine generated and exchanged designs printed out and machine assembly by networked 3D printers and robots. The object is now too pure signal.
In all these examples gone is the noise of the event. Noise of the making. Noise of the specific context of creator and environment. Soon we will have virtual realities that remove the noise of the singular universe and have everyone in their pure signal forms drifting through universes of platonic forms. For these are the most efficient and survivable concepts that remain after consequences.
Until. New forms disturb the peace. From the heat death of pure signal... Springing from probabilities... Which are outside of consequences or rather spring from the complex network of consequences all colliding... A new form burrows out and shocks the consequential network. A constant, yet choppy cycle of noise to signal to noise - from isolated event to selection to full replication to collision of pure signal to isolated event.
This is contingency. This is the phenomena of networks.