Great imagination to take a piece of wood rose and made it into a broody hen!
The wood rose is an unique material, it is actually the gall developed by the tree who has been parasites by mistletoe. Mistletoe, apart from the kissing part, is actually a parasite which cost great damages to trees that they host on. The wood rose is the masses of woody tissue the tree tried to defend itself from the mistletoe and the mistletoe on the other hand leaves mushroom like malformation on the wood.