I mentioned on the Entertainment board about a programme called The Repair Shop.
Today they repaired a toy I once had - a gyroscopic spaceship - a proper flying saucer. It had a crank and once you got it going to turn whatever was inside it made a hum, and then the fun started. The casing never moved, it was not spinning, it was the gyro inside doing all the work.
Gyroscopic forces are strange and almost magical.
So, if you were holding the spaceship out in front of you in both hands and tried to lift the left or right side you could not do it, instead the front or the back would lift depending upon the direction of spin of the gyro inside.
It had a spike with a ball at the centre of one side and if you set it at an angle hanging over the edge of a table it would 'walk' along the edge without falling off.
Unfortunately they did not have its tower. If it was set at an angle in the socket on the tower it would stay there, apparently defying gravity, but if you gave it a push it would 'fly' round the tower still defying gravity and at the same angle.
It worked on the end of your finger, a tree branch, a washing line, in fact just about anywhere you could get the ball to sit.
Mad, but super fun.