"A RESTful system progresses from one steady-state to the next and..." --@fielding #readingToday

_Hint: A RESTful system progresses from one steady-state to the next, and each such steady-state is both a potential start-state and a potential end-state. I.e., a RESTful system is an unknown number of components obeying a simple set of rules such that hey are always either at REST or transitioning from one RESTful state to another RESTful state. _