Novgorod porthole and medieval socket

Window of the Church of the Intercession and a medieval 4-phase socket on its wall. It would be interesting to look at the plug. Generally speaking, Novgorod medieval culture was significantly ahead of those in Europe at that time. I’m not talking about wooden pavements and wooden sewers, but for example, in Paris I have not seen medieval public outlets. And in Novgorod they come in all shapes and sizes, on almost every church...