Move your head around while looking at this picture, or use the scroll bar on the side of this page.
Which line is longer? Line AB or BC? They are actually the same length!
Which man in the picture is taller? If you observe, you’ll find out they’re actually all the same size!
Is there spiral on this Image? No, it’s actually just independent circles!
How can this be true? Observe the picture precisely, and answer will come. Feel free to comment this illusion, but please don’t spoil other’s fun…