I want to know something that European and American movies often appear on nightstands.

Lava lamp, also known as wax lamp, jellyfish lamp and magma lamp. Glass bottles are like flowing magma. It uses the principle of heat energy to create the eternal effect of light and shadow movement and change. The shape is extremely cool, but the low technology is extremely psychedelic. It used to be a popular interior decoration all over the world. Lava lamp was invented by British engineer craven Walker. Inspired by the egg boiling timer, he sealed a glass bottle with transparent liquid and wax, and then heated it at the base to create colorful effects.