The sculpture is positioned in a slope of 23,4 degrees, the same angle as the earth revolves relative to the sun. In geography, this angle constitutes our seasons. During the course of one year, the entire sculpture rotates slowly. Hence, giving us a sense of seasons, as it will be gradually tilting in different directions in Summer, Autumn, Spring and Winter.

https://www.flickr.com/photos/99027484@N08/16588521142/