Stare at the red dot long enough, and the grey stripes will disappear.
19.
Believe it or not, these lines are straight and parallel.
18.
Illusion created by Emily Knight and Arthur Shapiro
These "fish" may appear to be wiggling, but the only thing changing in this animation is the color.
17.
The two birds in this image are identical. Not just in size and shape, but in color too.
Don't believe us? check out the same image eith the background removed in the end of this page
16.
What's your first impression of this image? Yellow arrows pointing left, or green arrows pointing right? There is no "correct" answer, but different people perceive this image differently at first.
15.
Another "false spiral" -- actually a series of concentric circles, hard as it may be to believe. To prove that there's no spiral, try tracing your finger around one of the circles. You'll see that it never moves inward or outward.
14.
Via Mighty Optical Illusions
Stare at the center of this simple animation and you'll be convinced you're seeing a green circle moving around the edge. But are you?
in fact there is no green circle, see in the end of this page
13.
Lean up close to your monitor. What does this image say?
Try stepping back a few feet. What does it say now?
12.
Via Mighty Optical Illusions
What appears to be a gaping chasm in the middle of the street...
Created by Edgar Mueller, via Mighty Optical Illusions
...Is actually a street painting, seen here in mid-creation.
11.
Via Mighty Optical Illusions
Try moving your mouse pointer down across this image, following the pointer closely with your eyes. You should see a rippling effect moving through the picture -- even though it's a completely static image!
10.
Image created by Pech Misfortune, via Mighty Optical Illusions
A variation on a classic illusion, this cat can be perceived as rotating in either direction. With practice, you can make it switch at will!
Same like this
9.
8.
Image created by Professor Akiyoshi Kitaoka, via Mighty Optical Illusions
Believe it or not, this image is not animated. The effect persists only in your peripheral vision; if you focus on any one of the spirals, it will stop moving.
8.
Can you unweave this web and find the hidden word within it?
the answer is in the end of page
7.
More bang for your buck! This three-in-one illusion includes a false spiral, an impossible Escher-esque structure, and what appears to be a seriously warped floor...
The explanation is in the end of page
6.
Here's a simple one. Are these two rows of squares perfectly parallel?
the answer and explanation in the end of page
5.
Which square is a lighter shade, A or B?
the answer and explanation in the end of page
4.
3.
Can you tell which of these cars is the largest?
the answer and explanation in the end of page
3.
Which of these two dots is in the true center of the circle?
the answer and explanation in the end of page
2.
Are the walls of this house facing outward, or inward?
the answer and explanation in the end of page
1.
Can you tell where on this curve the lines are the longest, and where they are the shortest?
the answer and explanation in the end of page
The Answer and Explanation
The Answer and Explanation
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14.
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http://videogames.yahoo.com/events/brain-teasers/brain-teasers-and-optical-illusions/1400154
14.
Via Mighty Optical Illusions
A still frame from the same animation reveals that there is no green at all. Your eyes are perceiving a negative afterimage of the magenta circles -- when they disappear, your photoreceptors compensate by producing a ghost image of the opposite color (green).
8.
ANSWER: A little color-coding helps to reveal the truth.
7.
With the black and white squares removed from the tiles, we see that the lines on the floor are perfectly straight.
6.
ANSWER: They are indeed perfectly parallel, which becomes more apparent when the line between them is highlighted.
5.
ANSWER: Taken out of context, you can see A and B are the same shade. Our familiarity with light and shadow tricks us into thinking B is "actually" lighter than A.
4.
Believe it or not, the rightmost car is the largest. Our brain is wired to take perspective into account, hence the common perception that the leftmost car is larger.
3.
ANSWER: With the distracting lines out of the way, it's apparent that the green dot is at the center.
2.
ANSWER: Depends on how you look at it. If you isolate the top portion of the image, the house appears to be concave, facing inward. Isolate the bottom, and the perspective is reversed.
1.
ANSWER: They are all the same length.
http://videogames.yahoo.com/events/brain-teasers/brain-teasers-and-optical-illusions/1400154
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