For that purpose a number of them are attached to a frame and ignited simultaneously. Fountains come in all sizes, ranging from tiny fountains with a 2 cm flame for use on birthday cakes to fountains such as 'Clark's giant steel fountain', which reaches a height of many meters. The effect usually consists of a spray of sparks of different types and colors. Exploding microstars are sometimes employed as well. Rockets are among the most fascinating pyrotechnic devices man has ever invented.
Some people spend all their time on just perfecting and building rockets.
The Chinese are usually credited with inventing the rocket. Todays technology has made use of the exact same basic principle to propell spacecraft all over the solar system. This page cannot possibly cover the entire field of rocketry adequately. Instructions on building small rockets for propelling fireworks up into the sky are given. The motors are of the same ancient design used by the Chinese centuries ago.