If you could invent something new, what would it be?

If I were to invent something new, it would be levitational shoes. Instead of the future idea of a jet-pack, where a whole contraption must be attached to your body, levitational shoes would only be worn on a person's feet and work just the same as a jet-pack. When technology becomes more advanced in the future, the idea of levitational shoes is not an irrational idea because they would serve as a means of transportation. If a person in the city is tired from a long day at work and does not wish to walk numerous blocks to their destination, levitational shoes will satiate their body by helping them get to where they need to go faster and with less effort. If levitational shoes were invented correctly and safely, they would become a world-wide phenomenon.