Oops! You posted this months ago! I'm *so* sorry. A Catherine Wheel is a firework which spins around very fast, shooting out different coloured sparks. It's very pretty but is based on a horrible instrument of execution used in France in the Middle Ages - the breaking wheel. St Catherine was meant to be executed on it for converting the Emperor's wife to Christianity but according to the story, the wheel broke when she touched it, and so she was beheaded instead.

Thank you again for the feedback you've left. I'm so glad you're enjoying the fic.