Vision: Geometrical Illusions

6 flashcards · Biology · by lakesare

1. What does Hering illusion consist of?

   When 2 straight parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Researcher Mark Changizi explained the illusion in a 2008 article: "Evolution has seen to it that geometric drawings like this elicit in us premonitions of the near future. The converging lines toward a vanishing point (the spokes) are cues that trick our brains into thinking we are moving forward as we would in the real world, where the doo…

2. What does Poggendorf illusion consist of?

   The line is straight, but appears offset.

3. What's the real-life example of Poggendorf illusion.

   Interestingly, the flag of the United Kingdom is designed with shifted lines, perhaps to compensate (the bottom-left to top-right red line) for this effect.

4. What does T-illusion consist of?

   2 lines are same length.

5. What does Ponzo illusion consist of?

   Red lines are identical in length.

6. What does Zöllner illusion consist of?

   These lines are parallel.