I think I might mention something about perspective and about lines. How everything in essentially flattened into 2d, so everything has a contour. So it is like feeling a 2d shape on say a table, like a circular dish, but what you are seeing is actually a 3d ball.

Further, things can be obscured by other things that are closer, which are in front. It's a bit like tracing the dish with your finger, but not knowing that there is a smaller dish hidden beneath it. For example a ball is behind another ball.

Things that are further away are smaller than things that are closer. As the ball moves further away, the 2d contour becomes smaller. So in the analogy from before, the dish would shrink until it becomes too small to sense.

Finally, instead of just having a few fingers to trace these contours, we have millions of them, so we can effectively sense all contours all at once and tiny notice changes in real time.

Well I suppose I could extend the analogy further by saying that colors are like the physical textures that you feel when moving your finger over an object. The dish could be made from wood, plastic, porcelain and so on, and it is like we have fingers all over the dish at every point at once. Such textures, just like the colors, can be quite intricate.

I could go on but let's leave it at that.