It is a magical picture which would be changed by the distance between you and it. Try to watch the picture closely. Do you see a man? Then, if you move away from the picture, you may find something is different. The man of the picture changes into a woman! If you are wearing glasses, you can also observe the difference by putting on and taking off glasses.

     The effect of this illusion is caused by a contrast sensitivity function of visal system. The function differs from person to person. Though it seems to be incomprehensible, the concept is actually similar to vision measurement. The maximum distances that people can identify the man in this picture are a bit different. Have fun!

介紹

這是一個神奇的圖片。他雖然是一張靜止不動的圖片，但是根據你與圖片之間的距離，你會發現一些不一樣的變化。試著靠近一點來看這張圖片，你看到一個男人了嗎？如果看到了，這次請你退後一點再來看一看這張圖片，你會發現照片裡的男人竟變成了一個女人！如果你正好有配戴近視眼鏡，你也可以試著觀察把眼鏡拿下來與戴上時圖片的變化。

造成這樣視覺感知上的錯覺主要與視覺系統中的對比敏感度函數有關，而每個人的對比敏感度函數都不大相同。這聽起來似乎很複雜，但其實與視力測量的概念相似。當不同人從遠方走來，他們看到男人時的最大距離都會有些不同，這就是他們視力不同所造成的結果。祝你玩得愉快！

紹介