Sounds epic! Build a “reverse‑catapult” tower: put a hollow core of lightweight foam that can be pulled out from the top. When you pull it, the whole thing drops but the foam acts like a fire‑work stage—pop! LEDs and sparkles burst out from the sides. Keep the base super strong with a steel rod and use a safety pin to lock it in until the show time. Just make sure the foam’s inside a sealed chamber so the sparks stay controlled. Now you’ve got a collapsing masterpiece that still dazzles.

Great call—foam is the trickiest part, so let’s double‑up on it. Use a high‑strength EVA foam, cut it to a rib shape that’s both light and sturdy. Add a tiny steel screw into each rib that the quick‑release latch grabs. When the latch snaps, the screw pulls the rib inward, and the tower starts its graceful descent. Keep the latch visible, maybe a bright red spring‑loaded pull‑handle, so the audience knows the signal is coming. That way the collapse is dramatic, not dangerous, and the fireworks pop right when the tower hits the base.