Step 3Presenting the Illusion
Place the pencil over the transition border between the first two shades of blue on the far left. It will amazingly appear that the first two shades of blue are exactly the same! The same visual phenomenon will hold true when the pencil is moved to the border between the second and third shades. Finally, move the pencil to the transition border between the third and fourth shades. Each time a border is covered, the eye perceives the neighboring shades as being identical. Clearly they are not.
Again, here is the video that shows the illusion being performed. Enjoy!:
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