3 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 1621.18 Aperture of Absolute North

  The Aperture of Absolute North is a theoretical and, by some definitions, paradoxical designation for a non-operational structural feature w…

• MS 5821.18 The Gallery of Ligature Uncertainty
• MS 1072.63 Western Atmospheric Spiral

  The Western Atmospheric Spiral is a designated administrative zone within the Tower's West Spiral complex, encompassing the atmospheric regu…