My first book had some interesting reading in it last night.
The ship of Theseus.
Is it still the same ship if every plank of wood in the ship has been replaced because of decay?
The book talked about numerically indentical and quailitive indentical.
Looking very breifly at the philosophical arguements around if the Theseus would be the same ship or the restoration means she is not the same ship.
That made me think of the 3 ships just a couple of miles away from me, in Portsmouth dockyard.
The Mary Rose, 500 years old snd preserved. No replacement of any of the wood. Just preservation work rakes place.
The HMS Victory. A classic ship of Theseus. Virtually all the wood has been replaced over the last 275 years.
The HMS Warrior also has had much of her wood replaced. However as an iron clad hull, much of her metal work is orginal.
All very intetrsting stuff.