A literary map of Childhood Years (幼少時代) by Tanizaki Jun'ichiro — a late-life memoir of Meiji Nihombashi: print shop, rice dealers, Suitengu, Kabuki, and the abduction that still startles readers.
Pins mark homes, schools, bridges, restaurants, and theaters from the book. Blue still stands (or stands rebuilt). Amber is lost to quake, fire, or redevelopment. Each card carries a short quote you can hunt in the text.
Blue pins survive in some form. Amber pins are gone.