This go me thinking about doors throughout history, particularly in Rome. Matthew Kneale, in “Rome: A History of Seven Sackings,” writes that in 1084 gates/doors/portas both kept Henry 1V out and let him in during his invasion of the city. His purpose was to be crowned Holy Roman Emperor, and tradition had it that he had to be crowned by the Pope. He brought his own candidate (who became Clement III) because reigning Pope Gregory VII wanted no part of him.
As far as the mosquitoes and flies now being barred from entry into my house, I figure they’ll find another place to go. I wish them well.