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 3424.32 Doctrine of Non-Interference
• MS 9001.34 Edict of Conjunctional Inscription
• MS 5586.31 Penrose Stairwell

  The Penrose Stairwell is a structure reportedly consisting of four flights of twenty steps each, arranged such that a climber ascends or des…