Can you always trust your senses?
Perpetually ascending staircase.
How can the man go up all the time
back to the same place over and over?
The red squares are the same
in the upper part and in the lower part of the "X"
The diagonal lines are
There are no gray spots
corners of the squares.
The rows of black and white
are all parallel.
The center circles
the same size.
The Vertical lines
the same length.
There are only white circles
at the intersections
All the bumps are identical
The one in the lower right corner is
The image to the right is rotating.
Wavy Squares? No!
The background of concentric circles makes the
squares appear distorted.
The circles appear to rotate when you move your
head closer and further away from the screen while looking at the dot in the
There are no curved lines in this figure.
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