He made it so the potato was a royal food. This gave the potato a fake high value making it so people would want potatoes. This would make it so there would be an underground market of potatoes. The other man made it so prostitutes had to wear veils this stoped normal women from wearing veils. If they wore veils they would look like prostitutes.
It count as perceived because the ride of the trip wouldn’t change. The trip would take the same time, instead the passengers would be entertained till they get to the destination. Nothing but the happiness of the people would changed. The train would not have anything different.It would be more effective to change a person's perspective because it is cheaper and doesn’t take much. Like the one guy did instead of finding a different plant he made the potato have a fake value. When it came to the train you don’t need to change the train you need to change the trip experience.