A robot that lived in the future had an air-car that he liked to fly around his hometown on weekends. He was so successful at his job, which had something to do with magnets, that he was promoted and told to relocate to a bigger office in a bigger city. In fact he was despatched to the capital of the robot world, where the headquarters of his organisation was based. He agreed to do this and moved home.
In the capital city he worked hard and his colleagues were pleased by his performance, but when the week was over and all the employees went home for the weekend, disaster struck! The robot flew his air-car into the side of a building and he was utterly destroyed. He had forgotten that the capital city was constructed from transparent building materials. After all, it was supposed to be a futuristic design!
¶ Robots in glass cities shouldn't fly cars.