Poster printed with yellow, orange, green, gray, and black ink on white paper. An irregular black stripe outlines a page background that transitions from yellow at top to orange at bottom. An oval border at center contains a large 'X' of flowers created by bicycle tires cutting through gray ground patterned with cars and clouds of smoke. A male bicyclist throws pieces of paper in the air at lower left, and a female cyclist lifts a bottle in the air at lower right. "Critical Mass" is printed at top in bubbles that are coming out of the bottle. "...1992..." is printed in red at bottom left and "...2002..." is printed at bottom right. "Last Friday Every Month 6pm - Justin Hermann Plaza San Francisco" is printed across the bottom of the page.