> They're definitely abstractions, but they are used to reveal and illuminate a program's structure, not to hide it in a black box. In my mind, abstractions ar

> They're definitely abstractions, but they are used to reveal and illuminate a program's structure, not to hide it in a black box. In my mind, abstractions are used to reveal the program's interface and intent more than its structure. The functions, data structures, variables, and ultimately the source code reveal the program's true structure.