Contributed by anon-y-mouse
2 series of arrows, painted the same colour, in a straight line, spaced at random, on an urban sidewalk; each serie in an opposite direction. The series would be one or two blocks long.
Walking
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© Los Angeles Urban Rangers
Clue
From Institute of Applied Autonomy
Courtesy of Surveillance Camera Players
© Recetas Urbanas
Choose
© Jonathan David Marston
Friction
© 2008 Danilo Verpa