| Poggendorf's
Illusion
This illusion consists of
a straight line which disappears behind a solid rectangle and then
reappears on the other side. How
are you at lining things up? Test yourself with the "POG."
Move the top portion of
the line back and forth until it lines up with the bottom segment. All
done? Straight and true? Click the 'show' button. How close were you? Bummer. Well, you're not alone. Click 'hide' to try again, or 'reset' to correctly align the two segments. |