Even if you look at the same thing in the same space, people's perspectives vary. Knowledge is always relative. It is to compare two or more concepts and objects with each other, discover differences and reflect on their meaning. This bookshelf expresses the difference in people's perspectives. It visualizes the message 'You can see as much as you know'. While One side displays many books so that people can select among various books, the other side focuses on essential books as a recommendation for beginners.