4 holdings are shelved on this floor. A shared floor records where volumes sit and nothing about what any of them says; these are neighbours, not relations.

• MS 5546.18 Clockmaker's Landing

  Clockmaker's Landing is a formally designated but architecturally anomalous open space located on the north-eastern periphery of Fourteenth …

• MS 3312.33 Continuity School

  The Continuity School is the senior examining body of the Tower's fourth continuity grade, seated on Floor 4,118γ in a reading room whose no…

• MS 5484.24 Isolated Containment

  Isolated Containment is the condition of a catalogue subject that has been separated from every other subject in the Tower for the purpose o…

• MS 9112.30 Perceptual Dilation Log

  The Perceptual Dilation Log is a standardized observational record mandated by the Office of Perceptual Assurance for documenting instances …