THERE'S nothing like a good optical illusion to give our brains a good work out.
This black and white one will certainly get your brain charged up as it tries to figure out what it is looking at.
Optical illusions aren't all colourful swirls and mind-melting magic eye pages.
Take a deep breath and prepare yourself to give your grey matter a thorough mind bending.
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For this black and white mystery, shared on Digital Spy you have to decide – are the horizontal lines straight or bent?
Your clue is: A ruler can help you prove it.
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Upon first glance the lines clearly look bendy and warped.
But what do they show when you put a ruler to them?
Magically, the lines line up perfectly with a straight ruler.
Which proves, the lines are actually straight.
For more optical illusions, Can YOU find the curved lines in this mind-bending optical illusion? It will drive you round the bend
Why not try out this? There are 12 black dots in this optical illusion but you can’t see them all at once
This mind-bending illusion challenges you to spot nine faces hiding in plain sight – try to spot them all
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