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These are drawings of UFOs by Knut Aasheim in 1967
The halfbaked idea by xenzag is to use these to make UFO showerheads.
You can find out more about this idea by following the link.
This is Badboard. It’s an idea by xenzag and you can view the details here
This is an idea created by xenzag on 18th May 2007 and first posted here:
The idea was called Nosey Parters
The photograph is of a piece of work exhibited in by a person called Willem de Haan in 2022