This Rare Books Library in Boston’s North End occupies a very turbulent site, wedging itself in the middle of block. The project is an investigation into the use of two different frequencies of floor height, each associated with a different user. The staff and public are allowed to intermingle in certain locations associated with the superposition of these two floor frequencies. The public’s entrance leads to the main atrium of the building. From here, access to reading rooms and the stacks are staggered based on the logic of the changing floor frequencies.