A seat in the shape of a leaf with the text : "Kings lime tree Willem-Alexander 2013".
The lime tree was planted in honor of the throne change of our new King Willem Alexander in 2013. This custom to plant a tree with the arrival of a new King of Queen dates from 1898 when princess Wilhelmina became Queen. This was repeated for princess Juliana in 1948 and princess Beatrix in 1980. So you can find those trees in many places in the Netherlands always with a sign for which head of State is was planted.
Linking to signs, signs