This is the fly trouser button type.
Combines two dished buttons to make a small compass, bottom button has a small spike in it's middle.
This is placed on a flat surface, and then the top button is placed on top of the spike (quite fiddly).
Top button has two dots (North) and one dot (South).
When balanced correctly, the top button turns slowly until it stops.
The two dots are now facing North and when I tried it, it worked first time.
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