Normally I don't agree with any kind of killing, even of flies, but the idea for a better fly control mechanism cannot be denied. It's called as per the title: Planets of Dead and Dying Flies.
It's a simple mechanical device which attaches to any light bulb fixture that hangs from a ceiling. It consists of an orary type array of balls which orbit the bulb as if it were the star at the centre of a system of planets. Flies which are normally attracted to a light source naturally venture closer, easily navigating a pathway between the rotating spheres, but wait, the spheres have been treated with a coating of that sticky stuff that flies simply adore.
This means that in time, they become covered with a mass of dead and dying flies. Fly coated planets can be removed from their orbits and posted to Zag labs for research purposes, with freshly coated replacements returned in exchange.-- xenzag, Aug 31 2013 Inside-out mosquito net Inside-out_20mosquito_20netPrior Art [8th of 7, Aug 31 2013] [+] More morbidly entertaining than flypaper.
However, I have never understood why flypaper (or indeed these flyballs) cannot contain, in addition to the glue, something which kills flies on contact. There is nothing more gruesome than seeing a dozen flies glued in place, waggling their legs for days on end.
[EDIT: apparently flypaper used to contain arsenic which, not surprisingly, was banned. However, you'd think some more benign insecticide could be substituted.]-- MaxwellBuchanan, Aug 31 2013 So which one is correct; Orary or Orrery? Oh the horrery...-- 2 fries shy of a happy meal, Aug 31 2013 Not sure... Predictive text on iPad put in orary... Will check. Seems like either can be used.-- xenzag, Aug 31 2013 Morbid and a little bit disgusting. [+]-- Voice, Aug 31 2013 [+}, but also <link>-- 8th of 7, Aug 31 2013 random, halfbakery