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Really great optical illusions...
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Crazy Lines
after Martin Gardner
Which line is longest: AB or
AC? |
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Elusive Spots
Look at the color grids on
the left. Start from the red one. Do you see the light red spots at
the crossroads between the red squares?
Now look at the blue grid. Do you see the light blue spots blinking
like those red ones?
Finally take a look at the green grid. Can you see all those
flickering light green spots?
Are there really any spots between the squares, and why do they only
blink and try to disappear when you want to stare at any of them?
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Find the Center
by Martin Gardner
Which one of the two dots in
the illustration is the true center of the circle? |
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Impossible Object
by Serhiy Grabarchuk
This object looks to be
assembled of three rods and one frame.
Try to make it.
Do you think you will be successful? |
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Missing Piece
after Martin Gardner
It seems that someone took a piece of cake. But in fact it is still
there. Can you find it? |
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Pencil Illusion
by Serhiy Grabarchuk
Slowly scroll the page down.
Did you notice something unusual?
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Square Waves
by Serhiy Grabarchuk, Jr.
The straight lines on both grids seem
to be curved where they are covered with the shaded figures.
If you don't believe it and think this is caused by the screen try
to redraw them on the paper |
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The Inner Circle
Which of the two red circles
is larger? Are they really different or it's just a pretty good
illusion?
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Turning Digits
by Peter Grabarchuk
To demonstrate this illusion make a
simple device. Its two sides are shown in Figure 1.
Figure 2 will help you to draw the exact patterns on the both sides.
Take the device in such a way that to hold the pieces of string
between your fingers as shown in Figure 4. Now turn the pieces of
string very quickly to make the rectangle turning (place the cursor
over the figure 4 to see this motion).
How do you think, what image will you see instead of the question
mark? |
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