James' World 2

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On 26 February 2015, Cates Holderness, a BuzzFeed community manager, posted a picture of a dress, captioned: ‘There’s a lot of debate on Tumblr about this right now, and we need to settle it.’ The post was accompanied by a poll that racked up millions of votes in a matter of days. About two-thirds of people saw the dress as white and gold. The rest, as blue and black. The comments section was filled with bewildered calls to ‘go check your eyes’ and all-caps accusations of trolling.

Vision scientists were quick to point out that the difference in appearance had to do with the ambiguity of ambient light in the photograph. If the visual system resolved the photograph as being taken indoors with its warmer light, the dress would appear blue and black; if outdoors, white and gold. That spring, the annual Vision Sciences Society conference had a live demo of the actual dress (blue and black, for the record) lit in different ways to demonstrate the way the difference of ambient light shifted its appearance. But none of this explains why the visual systems of different people would automatically infer different ambient light (one predictive factor seems to be a person’s typical wake-up time: night owls have more exposure to warmer, indoor light).

Whatever the full explanation turns out to be, it is remarkable that this type of genuine difference in visual appearance could elude us so completely. Until #TheDress went viral, no one, not even vision scientists, had any idea that these specific discrepancies in color appearance existed. This is all the more remarkable considering how easy it is to establish this difference. In the case of #TheDress, it’s as easy as asking ‘What colors do you see?’ If we could be oblivious to such an easy-to-measure difference in subjective experience, how many other such differences might there be that can be discovered if only we know where to look and which questions to ask?

Take the case of Blake Ross, the co-creator of the Firefox web browser. For the first three decades of his life, Ross assumed his subjective experience was typical. After all, why wouldn’t he? Then he read a popular science story about people who do not have visual imagery. While most people can, without much effort, form vivid images in their ‘mind’s eye’, others cannot – a condition that has been documented since the 1800s but only recently named: aphantasia. Ross learned from the article that he himself had aphantasia. His reaction was memorable: ‘Imagine your phone buzzes with breaking news: WASHINGTON SCIENTISTS DISCOVER TAIL-LESS MAN. Well, then, what are you?’

Ross went on to ask his friends about what it’s like for them when they imagine various things, quickly realizing that, just as he took his lack of imagery as a fact of the human condition, they similarly took their presence of visual imagery as a given. ‘I have never visualized anything in my entire life,’ Ross wrote in Vox in 2016. ‘I can’t “see” my father’s face or a bouncing blue ball, my childhood bedroom, or the run I went on 10 minutes ago… I’m 30 years old, and I never knew a human could do any of this. And it is blowing my goddamn mind.’

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Photo by Christopher Anderson/Magnum

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