Smile! It's an upside-down rainbow... but you can see there's no pot of gold at the end of this one
Seen just a handful of times this stunning phenomena is known as the 'smile in the sky.'
Freak weather conditions created this reverse rainbow in Leicestershire where it was pictured by antique dealer William Freeman.
But while the sight looks like an upside-down rainbow, it is actually caused by light shining through tiny ice crystals in the clouds.
Shimmering: The reverse rainbow is caused by tiny ice crystals in the clouds
Rather than being caused by raindrops like normal rainbows, it is the result of freak atmospheric conditions, rarely seen outside the North and South Poles.
This is one of only a handful of occasions where an arc has been spotted in the UK.
And only a small group in the garden of a restaurant saw the shimmering arc for a few minutes in the sky in the early evening on Friday.