You have 20/20 vision if you can work out how many eggs are in the carton in just 10 seconds | The Sun

CAN you work out how many eggs are in the carton? If so, you certainly have 20/20 vision and good maths skills.

Get ready for a challenge and try cracking this riddle in just 10 seconds.

Optical illusions are pictures or visuals that trick our brains into perceiving something different from what's actually there. 

This intriguing phenomenon happens through a process known as "filling-in," in which the brain chooses particular elements from the visual information it gets from the eyes to highlight, IndiaTimes reports.

As a result, the various layers of an image can appear differently depending on where the focus is placed.

Are you ready? Take out your stopwatch and set it to 10 seconds.

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If you are able to count all the eggs in the carton on time, you must be a true genius.

But there's no need to panic if you couldn't figure it out, as it turns out only five per cent of people manage to solve it.

If your initial response was 16, then you are off the mark because you must account for the hidden eggs.

Ready to give it another shot?

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First, begin by considering how many there would be if this were a 3D image, starting from the base.

In a 4×4 arrangement, there would indeed be 16 eggs on the bottom alone.

Moving up to the next row, where there are three eggs, applying the same logic would yield nine.

Continuing, you have a 2×2 arrangement, which is four eggs plus the lone egg at the top. 

When you add them all up, there are a total of 30 eggs.

It's important to consider all the eggs that aren't visible as well.

Want to give a go at something simpler, perhaps?

Then tryspotting the hidden piglet in the circus in less than 15 seconds.

The tricky illusion can test your optical power and observation skills.

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