May I ask why the German army had a pointy top on their hats in WWI?

Hello, the hats with a pointy tip are for infantry, and the round ball ones are for artillery

The following is taken from the internet:

Introduction of WWI German Helmets and their Selection

At the beginning of the First World War, the German soldiers wore spiked helmets made of leather with metal decorations, which were initially designed by Frederick Wilhelm, the King of Prussia, in 1842, and were also known as the "Pickelhaube" (spiked helmet). The shortcomings of the helmet's design surfaced almost immediately, but King Wilhelm nonetheless added a number of useless attachments to his creation. The helmets were much more ostentatious than those used in World War I. In 1856, the king was diagnosed with mental illness, and all affairs of state were left in the hands of his younger brother, William, who died in 1861, and his younger brother became the new king, with the title King William I. The helmets were made in the 1860s and 1860s. Relative to the standards of the 19th century at the time, the M1842 helmet was all very ridiculous and very unpopular with the army, its high top being joked about by soldiers as being able to fit all their chores in it.The height of this helmet was lowered starting in 1856 and other simplified improvements were made up until 1895, after which the improved look was kept in use until 1914.

On January 8, 1871, the German Empire was formed at the end of the Franco-Prussian War, and King Wilhelm I became Emperor Wilhelm I. The German Army was formed in 1914, and the German Army was formed in 1914, and the German Army was formed in 1914. The German Army established few standards for military equipment until 1914, but the Army spiked helmet was an exception. The helmet had three main leather parts: a basic shell, a front tongue, and a rear hood sewn together with thread. The shell is formed by pressing a piece of leather into shape with steam on a large felt. After forming, it is first colored with several coats of black lacquer, and finally it is brightened with a coat of glossy lacquer. The front of the helmet was covered with a large gilded brass and steel helmet plate, which we will refer to as the "crest" of the peaked helmet, which was either a lion or an eagle, and symbolized the troops from the different German regions. The Close Guard Regiment, Training Battalion Units and the Bavarian Advance were silver-plated, and each of the kingdoms, duchies, countships and free cities within the German Empire had a different type of helmet insignia.

The spiked helmet offered little protection to the wearer in battle and was far more decorative than practical. The sides of this helmet are in the shape of an inverted V that pray protect the chin strap. Also compared to the pre-war style his shape has become a bit more rounded. The entire body of the helmet is decorated with different fittings made of leather, brass, silver and gray metal.

Most helmets were made of leather, but some were made of metal. For example, the Cuirassier helmet was made of metal. Late in World War I due to the shortage of leather the German army still adopted the felt infantry war era helmet, this helmet in addition to being made of felt, retained all the decorations of the previous leather helmet mountain, but was soon replaced by the new M16 steel helmet. The spiked helmets usually have an additional cloth hood so that the helmet is protected from wear and tear when not normally worn and in combat.