The caption read "A boy went to away to war in 1914 and left his bike chained to this tree. He never returned, leaving the tree no choice but to grow around the bike." Thank you to the boy and his sacrifice which allowed the tree to grow.
Caddisfly larvae build protective cases using materials found in their environment. Artist Hubert Duprat supplied them with gold leaf and precious stones. This is what they created. Don't know whether to pin this in Animals, or Art!