[astee]

Writing (parts of) an operating system, networking stack, interpreter, and text editor. It dispels all the magic.

Getting over the whole idea of beautiful or perfect code. Realizing that code is a medium of expression and that there is no single right way to do everything. Beginning to think of code as a clay-like medium rather than literary prose that needs to be beautiful like a cathedral.

Seeing how some of the most experienced and productive programmers do things in extremely simple straightforward ways, with no unnecessary cleverness, indirection, abstraction, or anything like that.

Seeing how linus torvalds is right. It's really all about the data structures. Once I understand the data structures and their relationships, I can understand any system. Dispelling the myth that some things are just "too complicated". Almost every problem or system I've ever come across can be reduced to a page of data structures.

Realizing the power of fast feedback loops. How just about any requirement or problem can be expressed as a test case. And that once you have the test case you can fix anything.