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They come in all shapes and sizes, with words written on them to explain what they represent: “fjord,” “tree,” “hail,” and even “fly swat.”

Teacher Bethan Stokes has teenagers Elliot and Shay in class doing some sensory maths by singing a song about numbers and asking them to use a fly swat to splat piles of cream with different amounts of cherries on the top.

Elephants use the hair on their tails as a fly swat.