INSTRUCTIONS: A Halloween pursuit across San Francisco.

The city spreads out before you. Rushing from point to point, lit by the slow strobe of fluorescent buses and dark streets. Stumbling into situations for a stranger's signature. Fleeing unknown pursuers, breathing hard, admiring the landscape and the multitude of worlds hidden in it.

For one night, drop your relations, your work and leisure activities, and all your usual motives for movement and action, and let yourself be drawn by the attractions of the chase and the encounters you find there.No bikes, no cars, just feet and public transportation.

Document your experience.