The famous German scientist Otto van Guericke demonstrated the properties of vacuum with two copper bowls ("Magdeburg hemispheres") in 1663. He put the bowls together to form a hollow sphere and pumped all the air out of the sphere. Two teams of eight horses were unable to pull the bowls apart. The German emperor was impressed!
Now Magdeburg, in honor of their favorite son Guericke, has chosen the copper hemispheres as their mascot. They even have a stuffed animal version:
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