It's a picture. 
People read from right to left, despite what tells them where to "look". Your brain processes that there's still more of the image from what is seen through your peripherals.
Image tells me look left, why would I do that? There's more to the image and curiosity is a human characteristic, so it will be explored. Doesn't make sense putting a "you failed". It does take time for the brain to process things, here's it dissected.

1 - You see text, so you continue to look further
2 - your brain is processing it
3 - you realize what the image is trying to tell you/make you do.
4 - confusion overwhelms
The average human brain takes approx. 0.05-1.5 seconds to process information, determined on the complexity and sometimes the speed of the environment in certain situations.

People read from right to left, despite what tells them where to "look". Your brain processes that there's still more of the image from what is seen through your peripherals.
Image tells me look left, why would I do that? There's more to the image and curiosity is a human characteristic, so it will be explored. Doesn't make sense putting a "you failed". It does take time for the brain to process things, here's it dissected.

1 - You see text, so you continue to look further
2 - your brain is processing it
3 - you realize what the image is trying to tell you/make you do.
4 - confusion overwhelms
The average human brain takes approx. 0.05-1.5 seconds to process information, determined on the complexity and sometimes the speed of the environment in certain situations.

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