If you look at this grey circle, can you tell me if the circle is solid or indeed composed of different shades of grey?
The answer, is that the circle is a solid shade of grey and the background is lighter at the bottom than at the top.
Intriguing, is it not. The change in luminescence from top to bottom even tricks your eye to think that the circle is bulbous when in reality it is flat.
Enjoy the image. Enjoy the illusion.
My name is Steve Howard. You have been reading the digital circus.