That's the opacity. It's one thing to write a program that solves a specific problem in a specific way. Straightforward IF-THEN-ELSE.

It's quite a different thing to write a starting bit of software and then tell it to keep attacking a problem until it finds a solution. By the time it achieves that solution, it had done so by beating itself into a shape that can find the solution, into "*that which knoweth the word*".

When the programmer or researcher now dives in to see how the software did what it did, she finds nothing but "spaghetti code," indecipherable yet functional.