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 The latest app that's sweeping the web is the fiendishly addictive, and surprisingly difficult, Kuku Kube.

最新颜色辨识应用程序Kuku Kube正在席卷网络,它像恶魔般使人上瘾,并且难度惊人。

It has been designed to put your colour vision and eyesight to the test by showing boards of coloured squares.

On each board, one of the squares is a slightly different shade of the same colour and the aim is to find this odd square by tapping it with your finger or clicking it with the mouse.

Although the game appears relatively simple, and starts with a board of just four coloured squares, it quickly grows to a board of up to 81 squares.

And the differentiation between the shades becomes more subtle over time.

Players get a point for every correct square identified, but if they click or tap the wrong square they lose a point.

Plus, players get just 60 seconds to find the odd square on each board before the timer runs out and the game ends.

It was created by Canada-based Network365 and is available for free on Facebook, Android, iOS and on desktop browsers.

There are eight levels, and as a player progresses the squares change orientation or add borders to make it harder.

On the desktop version the game lets you continue until the timer runs out, but on mobile apps players can't progress until they have scored more than 20 points on each level.

The app makers said scores lower than 11 are poor, scores between 15 and 20 is 'lower than average', 21 to 30 is considered normal or average, and a score higher than 31 means your eyesight is 'great.'

'This puzzle is designed to evaluate the quality of your colour vision,' said the developers.

'You should identify the difference, if possible, and share your result with your friends.'

But they stressed: 'Even though this test can be very accurate, it should never be used to replace a doctor's visit.

'[It] provides basic information and guideline for your eyesight and colour test, and is not intended to replace a full or partial eye examination.'

Eyesight and colour was recently linked to how we perceive the world by Michael Abrash, chief scientist from Facebook-owned virtual reality (VR) experts Oculus.
Facebook旗下的虚拟现实(VR)专家Oculus公司的首席科学家Michael Abrash,提出了视觉与色彩近来被联系到我们如何感知世界。

He explained that humans only have three colour sensors, we can’t see infrared or ultraviolet and we have a blind spot in each eye.

‘Our visual data is actually astonishingly sparse and even if we were able to accurately record and process every photon that reaches our eyes, we’d still have too little data to be able to reconstruct the world accurately,' he said.

He used the recent black and blue/white and gold dress as an example.

‘Our visual system takes its best guess and sends that to the conscious mind,’ he continued.

'The way that the brain compensates for the limited data it receives is by maintaining a model of the real world that it constantly updates as new data comes in.

'And it is that model, not the real world, that you experience and trust implicitly. We are inference machines, not objective observers.
“而这只是你所感受到的和完全信任的模型,而不是真正的现实世界。我们是一个干预机器,而不是客观的观察者。 ”

He then showed a red and blue pill on hands that were shown on a yellow background to give an example of how this inference model breaks down.

The colours of the pills are the same shade of grey, and the red and blue colours that people see are simply what their brains perceive, based on the rest of the information around them.

And even when a person knows that the pills are grey, they still see them as red or blue.

‘Your visual system isn’t interested in whether the photon coming from a tile on a random image are red or blue or grey,' Mr Abrash continued.

'Knowing that didn’t keep anyone from being eaten by lions on the Savannah. What it is interested in is identifying potentially relevant features, in the real world, under a variety of conditions.

'Your visual system constantly corrects for the colours in the scene. It is reverse engineering reality rather than just recording it. The colours seen are your brain’s “best guess.”’