The Ornäs birch, (Swedish Ornäsbjörk) is a variety of silver birch which is also the national tree of Sweden. (Wikipedia)
The original Ornäs birch was discovered in 1767 in the village of Ornäs, in the central Swedish province of Dalarna. The man who discovered it sent a description of the tree to the University of Uppsala botanist Carl Linnaeus. Cuttings were taken from the original tree, from which all Ornäs birch trees have been propagated. The tree fell in a storm on 26 May 1890. Two new trees were planted in its place, taken from cuttings of the original tree.
In 1985, the Ornäs birch was named as the national tree of Sweden, and examples have been planted in central locations in Swedish towns from Trelleborg in the south to Kiruna in the north.
The one in our town park here in Borås was planted in 1986 - which happens to be the same year that I moved here to live. So I'm used to just passing it without giving it much thought. But the other day I happened to stop and read that plaque on the stone, and ponder for a bit... No doubt the tree must have been quite small when it was first planted. But having walked by every now and then for 37 years, I can't say I really ever noticed it growing...
I asked the Bing Image Creator for a "woman watching a birch tree grow", and this is what I got:

