Chapter 4 deals with the human senses, and how they can be misleading in how we perceive the world around us. We trust our senses to interpret the world, but sometimes they give us the wrong readings or fill in the blanks with the wrong information. For example, if you are going down certain stairways for the first times you may reach a step that is slightly shorter than the rest, when you looked at the stairway your eyes saw each step as the same and all the other steps were the same, but then you hit that one step which may only be an quarter of an inch shorter and you trip. According to all the information your brain received from your sight that step should have been the same as the others, but it was not but and you tripped or stumbled. An example of your senses filling something in is when you are on the phone with someone and their is bad static, your brain usually fills in the blanks with things that make sense like the auto correct on your cell phone when you're texting.
Something that really peaked my interest in the chapter was this preceding image. The book says when people look at this picture for the first time they usually see one of two images an old woman or a young lady. In the book the picture is in black and white and all I could see was the young lady but when I saw the color copy online I immediately saw the old woman. For some reason, color made the difference for me in seeing both interpretations of the image.
My eyes did not tell the whole story
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This is a very interesting post. I often find times where my eyes deceive me. Sometimes I am looking down while walking, and all of a sudden I'll stumble on the ground itself! Embarrassing, I know, but I believe my eyes are very different from other people's vision. For example, I still do not see the old woman's face in the color picture. I stared at it for a good minute, knowing that I am supposed to be seeing an old woman, but I simply could not. I only saw the young woman looking at the moon.
The picture you provided above is a perfect example of this. I first only recognized the young woman, but after looking more closely I saw the old woman. After I noticed the old woman I had a harder time seeing either of them perfectly anymore, as I could only see both of them at the same time, unless I really concentrated my focus.