Imagine a computer like a PDP-11 but with more than 3 billion SP4T switches. The switches are various combinations of 'magic' and 'more magic'

the authors of the code are dead, there are no comments except for old code, and sometimes the comments run anyway

and it's wet

this is biology.

@NanoRaptor Every time you copy the code you get copy errors and that's a feature. Some parts of the code is really prone to duplication / failure to copy.
To run the code you have to run 35 trillion instances and the instances have to communicate.