Amid the technology-driven conformity of a digital age, Brightman'sshop insists on a nostalgic mode of management — information on its books andalbums rest on customers' individual exploration and shopkeeper's knowledge.
"A part of the shop is old-fashioned," Brightman said."It's about the surprise and discovery of spending time browsing throughbooks you never knew existed before,which gives a real sense of achievement."
剖析一下you never knew existed成分关系，重点是existed是哪个的谓语动词？
books you never knew existed before = books you never knew existed before. 这是嵌入式关系分句作定语修饰books。关系代词that在you never knew的宾语从句中作主语，被省略了。
