What are these mysterious coloured balls spotted in Sheffield stream?

Mysterious coloured balls in Porter Brook. Picture Roger Butterfield.
Mysterious coloured balls in Porter Brook. Picture Roger Butterfield.
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You might expect to find something like an abandoned trolley or a discarded bottle or two in a Sheffield stream.

But the scene was much more colourful today downstream of Summerfield Street in Sheffield.

These mysterious coloured balls appeared with no explanation and were spotted by photographer Roger Butterfield.

Do you know what they are or how they got there? Get in touch if you know more.