"From the start, anarchism was an open political philosophy, always transforming itself in theory and practice. This, too, might be seen as part of its very definition. Anarchism has to remain dynamic if it truly aims to uncover new forms of domination and replace them with new forms of freedom, precisely because of the ever-present strain between personal and collective freedom. Self-organization necessitates everyone's participation, which requires being always amenable to new concerns and ideas. Yet when people are introduced to anarchism today, that openness, combined with a cultural propensity to forget the past, can make it seem a recent invention—without an elastic tradition, filled with debates, lessons, and experiments, to build on. Even worse, it can seem like a political praxis of "anything goes"—libertine without the libertarian—without regard for how one person's acts impact another person or community. It is critical to understand anarchism's past in order to understand its meaning, but also its problems and shortcomings as well as what we might want to retain and expand on. We study anarchist history to avoid repeating mistakes, but also to know we aren't alone on what has been and will likely be rocky, detour-filled "paths in utopia," to borrow the title of a Martin Buber book. Of course, it's generally helpful to understand historical contexts. Anarchism, for its part, is in large measure filled out and changed by its lived engagement in social struggle and visionary experimentation."