This is a kind of Parking Number Plate which consists of a group of suspending number cubes. Homopolar magnetic field generates  mutual exclusion, so the number cubes can jump up and down when the car move, just liking fluctuant keyboard. There will be a connecting shaft between cube and pedestal that can provent number cubes fly away from pedestal, so do not need to worry about safety

Considering the difficulty of coordinating a magenetic  field generated by so many independent magnets, I designed another simplified version. The suspending module will be a whole, only two homopolar magnets will be easier to coordinate