So actually, when the image is taken to the brain, the brain actually has to flip that image right side up. And that's exactly why we see things the right way up, the right side up. Now, let's discuss our retina. So, the retina is basically this portion in the back of the eye, and the retina contains specialized types of cells known as the rods and cones. Now, rods and cones contain special photochemicals that are capable of detecting our life, absorbing the photons of light. And this photochemical is known as a pigment.