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2016_04_10_Optical_illusion

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10/04/16 <br />
by Carolyn Bointon<br />
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***BEST QUALITY PHOTO AVAILABLE**<br />
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A nervous flyer got the fright of her life when she looked at a photo she had just taken, which made the propellor blades look like they were melting.<br />
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Bobbie Laverne, from Ashbourne, hates flying but her son suggested she sat by the window so she would have an interesting view to distract her during the short hop from East Midlands to Edinburgh.<br />
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But when she took a photo on her Samsung tablet, to show him later, she had a heart-stopping moment as an optical illusion made the Bombardier Dash-8 propellor blades looked like bendy plasticine.<br />
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“I was flying to Edinburgh and I'm scared to death to fly.,” she said.<br />
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“My son said get a window seat, so I did, and all I saw was this.<br />
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“I thought it was going to stop any minute, talk about terrified.<br />
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“My nephew, who is a pilot, said there's more chance of a blade coming off and shooting through the window.<br />
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“That was nice to know, that I might be decapitated rather than just go bravely down, but it won't stop me flying again, reluctantly of course, but nothing puts me off anything.”<br />
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The optical illusion is caused by the relatively slow shutter speed of the camera compared to the rotational rate of the propellors.<br />
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It's similar to the so-called "wagon-wheel effect"  which causes spokes on horse drawn wagon wheels to look like they're turning backwards in films.<br />
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