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According to NewAtlas.com (https://newatlas.com/architecture/sun-tower-open/), construction of the Sun Tower exhibition building and outdoor theater is underway in the Chinese city of Yantai. The tower is being constructed by a French firm, Ducks Sceno and the engineering firm Arup, raising to 50m (164 ft) gracefully into the sky.  The tower symbolizes the historic watch towers of the Ming dynasty (1368 to 1644 CE). Yantai literally means "Beacon Tower", named for the watch towers that look out over the coastline to warn of impending attack from the sea.

nass news 2022 feb sun tower yantai

Adam Williams, author the the Sun Tower article of 16 Feb 2022 notes: "The concave form of the building will amplify sounds from the sea... Additionally, its shape has been created following careful studies of the sunlight during the times of the equinox in both the spring and fall. The main body of the tower will work with a plaza surrounding the building to track each equinox, a little like the Shanghai Astronomy Museum, by Ennead Architects. A water channel will cut across the plaza – a ruler of time – this is the straight line that the shadow of the Sun Tower will follow on the day of the equinox. A series of elliptical rings are set in the pavement pattern [with] the intersections between the rings and the water channel marking the building shadow's footprint at specific hours on the equinox day. At one of the outer rings, a series of fountains were designed to celebrate the 24 Solar Terms of the Traditional Chinese Calendar; on normal days they are synced with high and low tides."