What shape are the sides of the fireworks?

Individual fireworks height, time delay, noise, modeling the three-dimensional shape (air), color and other details, etc, are decided by the fireworks design and manufacturer, how many, through the power of medicine medicine cake shape, blazing order, add the control of the species and distribution of metal powder method. Fireworks in the air after full bloom, its three-dimensional shape is colorful, the most common is spherical, fan, flower, tree, column shape, and so on, there are a lot of special shape, such as spiral, font shape and so on. Which fan fireworks roughly from the side, is flat, so appreciate this kind of fireworks, must choose the right direction.