When I was in primary school, I liked to collect comic books, so I secretly took down the bed board at home, sawed it and nailed it into a simple bookshelf. Later, my father beat me up. But I still like my bookshelf very much. I collect my comic books, insect specimens, textbooks and exercise books. My childhood memories are compressed in that short bookshelf. Today I will introduce some strange bookshelves, some flying in the sky, some teardrops, some invisible, and some wild.