Neroche Primary School pupils have been invited to design and decorate cardboard trees for a display at The Brewhouse in Taunton.
The installation is part of the theatre's festive season and will be in its transformed art gallery, described as an "enchanting forest."
It coincides with The Brewhouse's winter production of Pinocchio, which the children will attend on Wednesday, December 11.
A spokesperson for the school said: "The pupils can't wait to walk through the display on our arrival to the pantomime."
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