Aftermass provides a brief history of the social and political climates which transformed Portland, OR into a bicycle Mecca. Prior to changes in local legislation, Portland used to be hyper-congested with automobiles. Over time, the city became receptive to bike lanes and bike culture. Although Critical Mass originated in the Bay Area, it migrated north and became a movement unto itself in Portland. The majority of the film is comprised of interviews which reveal different interpretations of the purpose and repercussions of Critical Mass. Furthermore, interviewees dispel rumors about the bike movement, tell anecdotes about CM’s history and reaction in PDX, and recall illegitimate police retaliation against bicyclists due to what they perceive as bike-centric anarchism. Some cite that CM is a means of reclaiming public space. Others suggest that it is as an opportunity for community outreach and political demonstration. Regardless, all interviewees agree that it is a unifier of people from various walks of life. Aftermass is an informative and engaging view for anyone who makes bicycling an integral part of their day-to-day life. Sidenote: Andy Singer’s Why We Drive (also released by Microcosm) is a nice companion. –Sean Arenas (Microcosm, 636 SE 11th Ave.Portland, OR 97214, microcosmpublishing.com)