Perpetually ascending staircase.

How can the man go up all the time and come back to the same place over and over?

The red squares are the same color in the upper part
and in the lower part of the "X"

The diagonal lines are parallel.

There are no gray spots at the corners of the squares.

The rows of black and white squares are all parallel.

Impossible Triangle.

Parallel lines at sunrise.

The center circles are both the same size.

The Vertical lines are both the same length.

Three-prong fork.

Ambiguous cubes

There are only white circles at the intersections

Wavy Squares? No!
The background of concentric circles makes the squares appear distorted.

Rotating Wheels
The circles appear to rotate when you move your head closer and further away from the screen while looking at the dot in the center.

Warped Square?
There are no curved lines in this figure.

If your eyes follow the movement of the rotating pink dot, you will only see one color, pink. If you stare at the black + in the center, the moving dot turns to green. Now, concentrate on the black + in the center of the picture. After a short period of time, all the pink dots will slowly disappear, and you will only see a green dot rotating if you're lucky! It's amazing how our brain works. There really is no green dot, and the pink ones really don't disappear. This should be proof enough, we don't always see what we think we see.

So never make a decision based on your observations...

Think of what you saw and what you heard...

Analyze the fact and make the decision.