01. Complex systems are built from simple ideas Complex software like databases, compilers, and browsers are treated like black boxes. You use them every day as a user, but you probably don’t understand them as a programmer, even though they are nothing but code. Why? They have little in common with programmers’ daily task. Their code bases are so large, so discouraging. But that doesn’t mean you can’t learn these things. People have built small, toy versions of these things for learning purpose...