Published in 1976, this book was remarkably prescient. The way that Piercy has structured her utopian community of the future is not too far off the direction that alternative communities have been moving since the '60s -- and which has only accelerated in recent years, with the greater focus on sustainability and alternate energy sources. She also does a nice job of contrasting the plausible future utopia with an equally plausible dystopia, in which everything is state-controlled, bio-engineered, and class divisions have flourished and multiplied. Both are presented as possible futures, and the main character is given to understand that she has influence on which future happens - by virtue of fighting or giving up. Whether or not the main character time travels or is merely mad becomes irrelevant.