Here's why you might have spotted mysterious rocks with secret messages hidden in Sheffield
Spotted a rock at the side of a Sheffield road scrawled with a secret message or painted in bright colours?
Welcome to the latest craze that is gripping not only Sheffield, but people across the country.
If you are wondering why colourful rocks are being left in woodlands, along riversides or hidden on paths near you, here's why.
Rock painting is rapidly becoming a bit of a phenomenon with adults and children painting stones with a design and leaving them in places to be found by others such as parks or tourist spots.
Finders can either keep the rock or move them to somewhere else and share their finds on social media.
A Sheffield Rocks Facebook page has been set up where people can share their finds and photos.
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A post on the page, which has nearly 600 members, said: "Yesterday in Chesterfield, I came across a painted stone with a message on it, mentioning "Chesterfield UK Rocks" on Facebook. Having looked into it, I thought: "Sheffield must have a lovely group like theirs!" . So here we are!
Fancy having a go? All you need is a few rocks, paints or permanent pens and a bit of imagination.
Paint a design or write a positive quote on the rocks then hide them somewhere for people to find.
You can include the Facebook group or hashtag of your local rock painting group so people can share where they found your rocks.
You can visit the Sheffield Rocks Facebook page HERE