Back in the old kampong, wherever there was food, the environment would be abuzz with houseflies.
Thus in every household there would be at least one food cover – usually a large one with a diameter of about one yard – to enforce a No-Fly Zone against the airborne invaders.
In those days, these covers were usually made of rattan, though some wire-mesh types were also available.
Ever since moving out of the kampong, I have seldom seen such covers. Perhaps, the general hygiene of the environment has been greatly improved, and thus houseflies have found it hard to eke out a living, and called it quits.
There are modern types that are made of plastic material, and have some degree of transparency. Too bad for the flies – can see, can smell but cannot get to eat.