What algorithm is used in this animation from Tatami Galaxy? Is there a name for this type of effect where many area sizes are increased/decreased in relation to each other? I'm looking for some type of algorithm, formula, logic, etc. for recreating this. Here is the effect (which I believe was created in After Effects):



Source: The Tatami Galaxy (Yojouhan Shinwa Taikei / 四畳半神話大系) - Clear END
It looks like a voronoi diagram with a non-Euclidean distance metric. Probably not Manhattan L1 but something close related, but maybe Mahalanobis with some kind of restriction on seed point generation and movement.

A similar result may be calculated with Weight-proportional Space Partitioning Using Adaptive Voronoi Diagrams when reducing spatial resolution of the domain. 

I guess yo'll find similar examples in ShaderToy if you look for voronoi examples, which code you could study, and could be much simpler than the algorithm in the paper.