Learning About The Human Eye Via A Grammar Textbook

Recently, while browsing through an old English grammar textbook, published in 1958, and designed for ninth-grade students, I learned something very interesting about the human eye--that we actually see the world upside down.

In a ten-sentence sample essay about how the eye sees objects, sentence seven begins, "Do you know that pictures of things around you enter the eye upside down?" The next sentence explains that "Your brain reverses the images for you." I never knew that.

To verify the accuracy of that bit of information, I asked my ophthalmologist about this and he confirmed it. So it is possible to learn something about biology even from an old grammar textbook. And what I learned underscores how amazing an organ the brain is.