As the ordinary-looking plastic top is spun it suddenly flips over, revealing its coloured base, and continues to spin upside-down.
The Flip over top (often known as a The Tippe Top) was invented
in 1950 by the Danish engineer Werner Østberg. His inspiration can
from a visit to South America where he had seen local people
playing with a small, round fruit. When they turned it by the
stalk like an old-fashioned spinning top, it would spin for a
second and then invert and spin on the stalk.
However some credit should be given to Helene Sperl who in
1891 patented a "Wendekreisel" in Germany. However the
patent ran out and it was never mass produced.