Great Optical Illusion

My friend, Vineet showed me this Optical Illusion. I wasn't so serious earlier, but the illusion did blow off my mind... To blow yours too, just figuratively, do try out..

1. Right click, and Save As picture.
2. Open the pic in Paint Brush
3. Use the colour picker tool (one that looks like an eyedropper).
4. Click inside either boxes A or B of the first image.
5. Use this picked colour to draw a thick line connecting box A and B. Watch as it converts spontaneously into the second image.

You will be tossed to see the box of apparently different colors merging as in the second image. No fun without trying it yourself. Enjoy.