There's no way that anybody could possibly understand a modern CPU all at once. What allows us to create them is that we've inserted various abstraction barrie

There's no way that anybody could possibly understand a modern CPU all at once. What allows us to create them is that we've inserted various abstraction barriers into their design to break them up into comprehensible pieces that can be understood one by one. Evolution doesn't have the same need to insert abstraction barriers for comprehensibility, so its designs may be truly incomprehensible - at least to being with a working memory as small as a human's is.