The arrows depict the entrance and exists of the mazes.
Maze Portrait of Al Gore: An Inconvenient Maze:
More Mazes are available at http://www.InkBlotMazes.com
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Maze from Ape To Zebra
Maze created by Yonatan Frimer. Entrances and Exits are marked with arrows.
You can find more mazes like this one at http://www.teamofmonkeys.com
Maze Portrait of Lily Allen, Created by Y.Frimer, author of "Maze Art" - A coffee table book of such mazes.
More Mazes can be found at http://www.teamofmonkeys.com