Bourdon Illusion

The upper side of the left-lower triangle is actually aligned with the upper side of the right-upper triangle, the former appears to tilt counterclockwise while the latter clockwise.

Fraser Optical Illusion

When slightly tilted line segments are aligned horizontally like the figure, the whole array appears to tilt toward the tilt of the line elements. This is a reversal of the Zollner illusion or acute-angle contraction.

The Operating Table illusion

Most people will see that the top platform tilts down to the right side . In reality, both the rectangles are completely horizontal . The diagonal lines fool our eyes.

Bending White Lines Illusion

The White Lines in between the Circles appears to bend.

Bending Red Lines Illusion

The two red parallel lines in this image are straight,but when comes into the black line area,these red lines seems to be bend.

Vertical Bent Lines Illusion

Similar to the previous Distorted Diagonal Lines The vertical lines in this image are all straight ,they are just appears to bent.check out more

Distorted Diagonal Lines

The stars appear to warp the red lines, but they are perfectly straight.

Purple Bending Lines Illusion

Would you believe these two purple lines are straight ?

These two lines are perfectly straight.It's just the background that makes it look like they are not.