The most significant historical change in the library field was the introduction of stacks in the early 20th century. The prominent structures used to house and protect tomes are a familiar sight for library patrons. For many, the idea of entering a library without seeing an immense collection of books is unthinkable. Despite this, a New York public library attempted to do just that. However, the engineers tasked with planning the project immediately opposed the concept, opting for a renovation that would leave a significant portion of the book collection on-site.