This Illustrates That
Our senses cannot always be trusted.
Our mind is the final arbiter of truth.

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

 
 
 

There are 12 dots in this mesh, but our brains don't allow us to see them all at once

 
 
 

All the bumps are identical
The one in the lower right corner is upside-down,
The image to the right is rotating.

 
 
 

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.

 
 
 

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

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

Analyze the fact and take the decision.