The first number represents the position on the floor, and the second number the angle of the chair. (The red handwritten letters identify the chairs by style: Arne Jacobson, Bertoia, Stick, Empire, Steel, 30s Lawn.) On Day #1, Chair #1 was placed in position #62 on the floor, at an angle of 113 degrees. Chair #3 was not used.
Référence: http://www.mattress.org/Catalogue/Cage/cage.html