For the same purpose, surveillance yagura have been built not only in a fortress but on the streets of Kyoto City, which was portrayed on "Ippen Shonin Eden (Pictorial biography of the monk Ippen)."
同様の目的で城郭だけではなく、京都市街の路上に建てられた監視用の櫓が『一遍上人絵伝』に描かれている。