All it takes is a few strokes of white paint to transform our perceptions, writes Kelly Grovier.
It doesn't take much to send social media into overdrive, or, for that matter, to turn a 17th-Century portrait into an incontestable masterpiece.
All you need is a dab of pure white paint and a functional primary visual cortex.
Taken together, those two key ingredients - one available from any good art shop, the other found in the occipital lobe of every human brain - are responsible for the magic behind both a viral photo that's currently wrecking the eyes of internet users all around the world and one of the most hypnotic paintings in Western art.
What started innocuously at the beginning of the week as nothing more than a quirky point-of-view snap of an Instagram user's legs has quickly escalated into an internet sensation on a scale not seen since the hotly contested colour of 'that dress' in 2015 made the world want to tear its eyes out.
At issue in the current hullabaloo is whether we initially perceive an unusual slickness to the skin, as if the legs had been oiled, or whether we see merely a few streaks of white paint smudged on her bare outstretched pins.
In the 48 hours since the photo of Hunter Culverhouse's legs was re-posted on Wednesday by a mischief-making Twitter user, social media hasn't stopped wringing its hands over what is and isn't visible.
Particularly unnerving to some viewers of the photo has been their inability to re-see the initial shininess that they had first perceived and to unsee the painted streaks that - look away now if you don't want to know the score - are really what's responsible for conjuring the appearance of glossiness.
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