Compass

What can you do here
Turn the compass around its vertical axis. Note that the pointer (the magnetic needle) keeps indicating the same direction.

How does it work
The metal compass needle always keeps pointing the same direction, because it is influenced by the Earth’s magnetic field. As opposed to regular  compass, this one is additionally equipped with sight.

Interesting facts
The Earth’s magnetic poles and its geographical poles do not overlap. Moreover, the magnetic poles also change their position as time passes. In the case of Kraków, the North shown by the magnetic needle is 4º to the East of the meridian. The North Magnetic Pole is currently in the Arctic Ocean, near the coast of Canada (85,6º N, 143,3º W), approximately 500 km from the geographical pole.