This is an artwork in "Ars Electronica Garden Hsinchu / Taipei" of ARS Electronica Festival 2021. During the Covid-19 epidemic, every building is covered with QR-Code. People were "qualified" to enter buildings by scanning the QR-Code. The order of freedom and rights of our society are reorganized. We collected more than 2000 entrance QR-Codes and photos of National Tsing Hua University (NTHU). We also developed a "recursive QR-Code program" for generating the QR-Code of "Library" at NTHU from 2000 entrance QR-Codes. We saved it with NFT and auction it as a deal on the NFT trading platform. It records all the responses of NTHU and the campus memory for facing COVID-19 in 2021. ( link - http://techart-ars.tw/2021/?page_id=289 )