This novel illusion is based on a static Op Art work by G. Sarcone aptly named “Straight or Not”. The initial optical pattern consists in two concentric checked frames having inside and outside edges perfectly straight, as shown below:
Then, alternating black and white polka-dots are added. Now, though the checked frames are perfectly straight, the overall appearance is a wavy pattern!
Actually, the small white and black dots create layouts of ‘subliminal’ oblique lines, which interfere with the orthogonal outlines of the frames creating the bulging illusion. If you observe the static picture above with half-closed eyes, you can perceive these subliminal’ oblique lines similar to the blurred figure below (this optical effect is related to Zöllner illusion).
So, I wondered what would happen if I move and invert the position of the dots in a continuous loop? What I discovered is that the wavy effect not only does not disappear, but generate an undulating counter-effect: the frames appear in fact to wave back and forth.
The viewer can see that ONLY the small dots are moving and cause the concentric checked frames to appear to wobble continuously. Amazing, isn't it?
The viewer can see that ONLY the small dots are moving and cause the concentric checked frames to appear to wobble continuously. Amazing, isn't it?
This visual illusion was taken from Sarcone's book "How to Draw Incredible Optical Illusions".
You can buy a print of this neat optical illusion from my online Store!
