Made this out of scrap MDF to stop an annoyance in the bedroom! seeing as the UK is having a mini heatwave 
Can you guess what it is…….
I will post the answer tomorrow
A rectangular bit of scrap MDF with holes in it 
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Close, that was what the first attempt was! 
Hmm…A device to keep something furry/feathery in or out, to be affixed to an open window?
Well @Matticustard you must have come across a similar issue spot on, it’s to stop the cat using the bedroom as a rat run at night through 1 window and out the other
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Lol. I’m genuinely surprised I was right. I had a number of thoughts, but the heatwave comment was a big clue. Still, just a good guess.
Looks like it does the job required!