When you look at the circulation you can see the blood is flowing. This is caused by microsaccades or Eye moment, and the tiny moving thing is believed are after images of the black and white lines.

Check whether the yellow lines are all straight. Even if you feel they are not Recheck them

I’m here-by claiming that lines A-B and A-C in picture below, are of the same length. You don’t believe me? That’s fine, just meassure them yourself!

If you measure you will see that the lines really are straight!!!

Is the length of the line same in both the cases? The answer is yes, but it may look that length is different and that is due to the position of the circles.

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.

Hard to tell the lines are not curved.