It's turtles all the way down. We tend of think of everything as an ideal model in a vacuum, forgetting that in real life that the implementation details are o

It's turtles all the way down. We tend of think of everything as an ideal model in a vacuum, forgetting that in real life that the implementation details are often gory with caches and microcode and fault tolerance and all sorts of hidden details put in there to make things easier to work with or faster.