I saw some square fireworks this summer and I can’t figure out how they were made. They were really square, and not just lopsided circles. They had very straight lines and definite corners. How in the world could these be made?
For that matter, I’ve also seen hearts, peace signs, and fish sparkle in the sky, and I’m very curious about the science behind the special shapes.
The best I can come up with is having the shell explode, with the stars tethered to a central core, each with a string of a different length so that when they’re stretched out, they make the right shape. But I doubt that these tethers I’ve imagined would be able to withstand the force of the explosion.
Does anyone know how things like this are actually done?