Also, your dad is 99% of the way to having an enormous "memory palace" if he's got all of Cork memorized. All he needs to do is imagine a walk between any two p

Also, your dad is 99% of the way to having an enormous "memory palace" if he's got all of Cork memorized. All he needs to do is imagine a walk between any two points in Cork, then imagine the things he wants to remember at different places along that journey, such as at every intersection. To recall, simply imagine repeating the journey, and the remembered items will be at the intersections. Digits of pi or the order of a deck of cards are a good way to test it, and the cards bit is great for pub tricks and free beers.