optical illusion 视觉假相

1. A 和 B 那个颜色更甚？

2. Stand 1.5m or more, you can see it clearly;
but when you are close...

There is this old saying:

Kissing is a mean of getting two people so close together that they can’t see anything wrong with each other – Rene Yasenek

3.


4. are the purple lines straight or bent?

5.

6. how many black dots in this figure?