Optical Illusion: Are these lines straight or do they bend

The cafe wall optical illusion posted on Twitter challenges people to figure out if the lines are straight or bend at an angle.  | Trending

Optical illusion lines Cut Out Stock Images & Pictures - Alamy

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How many overlapping lines are there in this pic?

This mind-bending optical illusion makes you feel like you're hallucinating

This optical illusion made of straight lines may show you something else. Brain is bleeding, says Internet - India Today

Hering illusion - Wikipedia

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Visual illusions pictures - geometric illusions and strange angles

This incredible optical illusion is messing with people's minds - Cambridgeshire Live