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Poggendorf's Illusion II

A straight line passes behind a rectangle. This illusion will test your ability to track a straight line across an obstruction.

Drag the top line segment back and forth until it looks like it is lined up perfectly with the bottom portion. Now click the Show button. How far off were you? RESET button will automatically align the two line segments.

Java Applet: Copyright 1997 Tony Azevedo

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