There's a housefly in my apartment. Right now it's on a window screen, trying to get out. Unfortunately, it's not a screen that can open. So while I do appreciate that my unwanted visitor is trying very hard to do the right thing through the most logical means possible, it's still going to die a rather unpleasant death. Which really isn't fair at all, but I'm incapable of compassion or decency towards anything with more than four legs.
But wouldn't it be awesome if the screen could let it out, without letting anything else in? If they could invent a screen that would open a little tiny bit if something on the inside tries to get out while not letting anything from the outside in. Then bugs could just leave if they wanted to!
Unidirectional valves exist, unidirectional doors exist, so why not?
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