The 'op art' dynamic designs play tricks with the brain fooling it into thinking the images are moving when in fact they are static.
And fans of the images say the effect of long-term exposure is like a free natural high.
One artist claims: “If you look s at these images intensely enough you should get the effect of magic mushrooms.”
Op Art became a fine art movement in the 1960's and was pioneered by artists like Bridget Riley and Victor Vasarely.
In 1965 the movement became accepted by the artistic establishment with an exhibition at the Museum of Modern Art in New York called The Responsive Eye.
This wownews.co.uk reporter can confirm that while putting this report together and working with the images he was left feeling slightly woosy and nauseous.
Whether that qualifies as a natural high is a moot point.
Try it for yourself and see!