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


4. are the purple lines straight or bent?


6. how many black dots in this figure?


About yhtian

I am an academic researcher working on Offshore Geotechnical Engineering. My blog aims to write down some work related trivial things and tricks about software, programming. It is basically a memo for me to back up some thoughts and small details. But I am more than happy if someone would visit and discuss.
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