Happy New Year everyone!
Proferssor Dejan Todorović of the University of Belgrade created this optical illusion that highlights the effects of two different illusions known as the Hering illusion and the Zöllner illusion. The blurred orange lines (representing a Torii, a traditional Japanese gate located in front of a shrine) are identical in all three images. Notice how the background lines in the second image make the orange horizontal line appear to bow downward as the vertical lines seem to tilt inward. By changing the orientation of the background pattern (see third image at the bottom), the orange lines appear to bow and tilt in the opposite direction.