In the 21st human invented a lot of thing that once could never be imagined. They invented light bulb to clear the boundary of night and day, they make travel much faster and more efficient, they created flying bird to carry people to many places, they can even see and talk to each other on the other side of the globe and so on. By imagination and creativity. They were be able to transform useless materials like rock, trees into useful stuffs. But, pushing productivity too much create numerous problem. They created paper but they have to cut down trees, they created car for faster transportation but car accident is inevitable. That is why they invented a lot of symbol, drawing on the street to help reduce it. This is called “crosswalk”

Return to article.