Those red shapes are outline of the Oyster card readers in underground. What i found something interesting is if you see them from lower viewpoint, just only one reader in front of all at there of course, then if people who far from you touch the Oyster reader is looks like they are using a much bigger machine.
The meaning of this series of red line symbolic shapes i made are refine from those symbolize spaces where people use it everyday. The trapezium for Up and Down space; the circle for traffic space and the triangle for moving space.
How to create them ?
yes.. Anamorphosis !
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