A codex represents alchemical initiation by a seven-runged ladder up which climb blindfolded men; on the seventh rung stands a man with the blindfold removed from his eyes, facing a closed door.
Eliade identifies the blindfold as a canonical emblem of initiatory ascent, its removal at the highest rung marking the threshold between esoteric preparation and the mystery that remains sealed.
, Shamanism: Archaic Techniques of Ecstasy, 1951thesis