The Sea organ (Croatian: Morske orgulje) is an architectural object located in Zadar, Croatia and an experimental musical instrument, which plays music by way of sea waves and tubes located underneath a set of large marble steps. The Greeting to the Sun (Croatian: Pozdrav suncu) is the monument in Zadar, Croatia dedicated to the Sun. It consists of three hundred multi-layered glass plates placed on the same level with the stone-paved waterfront in the shape of a 22-meter diameter circle, with the hoto-voltage solar modules underneath. Lighting elements installed in a circle turn on at night, and produce show of light. Monuments symbolize communication with nature, Greeting to the Sun has the aim to communicate with light, while the nearby Sea organ represent aim to communicate with sound.