Installation by land artist Paul de Kort in De Biesbosch National Park, Netherlands

© Frans Lemmens/Alamy

Installation by land artist Paul de Kort in De Biesbosch National Park, Netherlands

Land artist Paul de Kort created this installation in the central Noordwaard region of the Netherlands’ De Biesbosch National Park. The spiral of earth interlaces with the freshwater tidal flow of the waterways inside the park. As the tide comes in, the spiral becomes submerged; when the tide recedes, the spiral re-emerges. In this way, the changing visibility of the sculpted earth mimics the waxing and waning of Earth’s moon, from full circle to slim crescent. Of course, the land artwork’s phases also illustrate the moon’s effect on Earth’s tides.