North of the castle ruins is this large sculpture made of old barrel hoops, which was designed according to an idea by Joachim Hoffmann. Here you can deepen your understanding of "Land Art" if necessary 😉 : de.wikipedia.org/wiki/Land_Art
The defining feature of Land Art is the creative, preferably minimalist and often radical intervention in a landscape to create a three-dimensional, always site-specific and often ephemeral work of art.