Stare at the black dot, then move your eyes closer to the screen.
Tried it. 1 dot turned to 2 dots
Wierd! The two outer circles turn in opposite directions- without actually turning at all!
Maybe I'll try placing a dot in the middle of my charts..........
Yes, I did it. 2 circles are rotating in different points. I've heard that it's good to practise these kinds of illusions to make your eyes rest after spending hours in front of the computer.
The beginner's guide to FX trading