Useless Library

The world has undergone tremendous changes, everything is seeking to be "useful", and poetry and music have become waste. The abandoned son fled into a strange library, which was full of strange books such as "How to Feed Your Shadow", "Slowing down the speed of light to appreciate the raindrops falling outside the window", "Collecting the Eleven Temperatures of Dusk" and "Teaching the Wind to Play Forgotten Melody". I thought I could lie down until death, but unexpectedly a pursuit ensued. In desperation, he could only learn and sell now, using the "useless" knowledge in books to save his life. Until he discovered that this library was actually the last spark of the world's recovery...