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Different images of digit 3 in different shapes and pixel value arrangements.

Let’s start with a simple image of the digit 3. The digit 3 may be written at various angles or directions, even at an extremely low resolution of 28 by 28 pixels, our brain has no trouble recognizing it as a three. Isn’t it intriguing that human brains can do this so effortlessly?

In all the three images above, even though the pixel value of each image is different from another, it is very easy to recognize each one. The light-sensitive cells, i.e. the rods and the cone cells, present in our eyes that light up when we see the…

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