In 1983, King Olav V of Norway presented this rock to King Carl XVI Gustaf of Sweden. It symbolises Noway’s thanks for Sweden’s support in the Second World War, because nothing says ‘thank you’ like moving a 15-tonne rock 300 miles. It sits near the Royal Norwegian Embassy in Stockholm.

Not far away, there’s a very different rock: Space Seed by Bigert & Bergström. This bronze sculpture, inspired by a meteor shower, is intended to reflect both the destructive power of meteorites but also their suspected role in the origin of life. While the outside is burned and dark, the inside has a shiny golden finish. I rather liked it.

Apparently, Bigert & Bergström envisages people sitting on and crawling through their rock. I suspect the same behaviour would be frowned upon for the memorial rock. It’s so hard to keep up with rock etiquette these days.