flowing-water

This image shows a "Cáliz"-type floating fountain illuminating a lake at night. The fountain creates a beautiful, upward cone-shaped spray of water that resembles a chalice or goblet, hence its name.  

It is illuminated from below by a bright light, likely an LED spotlight, which accentuates the water's form and creates a mesmerizing play of light and shadow. 

The reflection of the fountain and the lights on the calm water adds to the enchanting atmosphere. This type of floating fountain is ideal for adding an elegant and dynamic focal point to lakes and ponds, especially in the evening.

What is it used for? Is it just for decoration or does it have another purpose?

2. Water quality improvement: The water movement created by the fountain helps to prevent stagnation and reduce the accumulation of organic matter that can lead to unpleasant odors and poor water quality.