ALT A playful colorful cartoonish poster by Hugh D'Andrade. Several silhouetted figures ride bikes across the poster. Colorful abstract shapes scatter the background. At the bottom is a crooked silhouette of San Francisco skyscrapers with colorfully lit windows. Text reads: 1992, 2012 CRITICAL MASS SSAN FRANCiSCO Abstract shapes contain text: 6:00pm + or - I want to ride my bicycle I want to ride my bike Public Space And No One In Charge Talk Fast Ride Slow Worldwide Movement Last Friday Every Month For 20 Years! HD'A 2012

ALT Black and white flyer by Joey Lusterman Playful "SAN FRANCISCO CRITICAL MASS 30 YEAR ANNIVERSARY" with a cartoonish bike lifted into the air by a single upraised fist. "9.30.1992/2022; embarcadero plaza; meet 5:30pm roll 6:30" scrawled across the background

ALT A colorful detailed poster illustration by Mona Caron An woman stands beside her narrow fixie bike, angelic wings rising from her back. She wears a purple short-sleeved crop top and green shin-length jeans. She smiles slyly, holding a loose bundle of small flyers as well as a yellow ribbon flowing backwards. In the background are illustrations of a cassette of bike gears, a colorful street filled with people riding bikes, and a view of the yellow sun setting above the golden gate bridge. Top text: "10 YEARS; CRITICAL MASS" Bottom text: "SAN FRANCISCO - FRIDAY SEPTEMBER 27th - 2002"

ALT A colorful detailed poster illustration by Mona Caron An woman struts forward holding a skinny blue bike, smiling confidently. Angelic wings rise from her back and hair flows backwards from her head. In front a young child rides a red tricycle, wings emerge from his back as well. In the background are illustrations of a cassette of bike gears, a colorful street filled with people riding bikes, and a bright view of the Ferry Building from Market St. Top text: "20 YEARS; CRITICAL MASS," with side banners "RECLAIM," "OCCUPY" Bottom text: "SAN FRANCISCO - FRIDAY SEPTEMBER 28th - 2012"

ALT Black-and-white flyer with a gradient of bicycles in a row, "BICYCLISTS!" written above. Text: Reduce Invisibility! Join the New Monthly RIDE HOME TOGETHER! Last Friday of Every Month 1st One: Sept. 25 5-5:30 p.m. Foot of Market St. SF Aren't you SICK & TIRED of having to fight for your life on city streets? Why are we treated like cars by the law, but like obnoxious and unwelcome obstructions by people in cars? WHERE ARE WE SUPPOSED TO GO?! Aren't we doing ourselves and humanity a favor by commuting on bicycle? JOIN US ON THE LAST FRIDAY OF EACH MONTH AND RIDE WEST UP MARKET STREET (Groups will split off to various neighborhoods by their customary routes). Come on your bike and help us all MAKE OUR PRESENCE FELT! (Imagine 25, 500, even 1,000+ bikes heading up Market together!) Sponsored by the San Francisco Bicycle Coalition, Bay Area Bike Action, and the San Francisco Bike Messenger Association MORE INFO: 751-BIKE

ALT Cartoonish imagery of people riding bikes bursting out of the top of a cake. Text on the side of the cake reads "CRITICAL MASS; ONE YEAR OLD!" Signed JRS 93 bottom left. By Jim Swanson.