When Shoghi Effendi completed the construction of the Shrine of the Báb on Mount Carmel, he decided to place a piece of plaster from the cell in which the Báb had been imprisoned in the Castle of Mah-Ku, where he had been denied even a lamp, underneath one of the tiles in the dome of the Shrine. The Hand of the Cause Leroy Ioas, with the assistance of a workman, prepared a place for the silver case containing the plaster. Shoghi Effendi approached the Shrine, and Mr. Ioas wished to precede him in climbing up the scaffolding, to test its strength, but the Guardian said, "You forget, I am a mountaineer."