Imagine outcomes randomly jiggling through the possibility space.
An outcome by itself tends to evaporate.
Outcomes that pile on and accumulate can grow into stable structure.
As the coherent pile gets larger and has more surface area, there's more likelihood a random outcome touches it and coheres, which gives compounding momentum.
This is a metaphor for finding consensus and other emergent phenomena.
The more degrees of freedom in the possibility space, the less likely the outcomes randomly cohere.
Constraints reduce the degrees of freedom, making it more likely ideas cohere and build.