Here is an interesting article fromt he Vatican News Service regarding the urns into which the ballots are placed during the conclave.
As you may know, each time the cardinals cast their individual vote in conclave, they approach the front of the Sistine Chapel, standing before the crucifix and the frescoe of the Last Judgment and swear that they are voting for the man with a clear conscience. They then place the folded ballot into a chalice-urn and a plate is put over it.
NEW CHALICE-URNS FOR ELECTION OF POPE
Vatican City, 5 March 2013 (VIS) – On a tapestry hanging in the eponymous gallery of the Vatican Museums, we find one of the oldest witnesses of the chalice-urns that served to gather the ballots of the cardinals voting in the election of a new pontiff.
The tapestry relates an episode narrated in the chronicles of the election of Pope Urban VIII (1623-1644). In the final scrutiny, during the counting of the ballots, one ballot was missing. On the right-hand side of the tapestry, one can see a scrutineer who is looking inside a large chalice with attention and interest, as if to verify the presence of the lost ballot.
A chalice that is very similar to the one seen in the tapestry and a pyx (ciborium) are preserved in the pontifical sacristy of the Sistine Chapel. This chalice and pyx have been used to gather the voting ballots in the conclaves of the last century, up to the election of John Paul II.
With the promulgation of the Apostolic Constitution “Universi Dominici Gregis” concerning the period of Sede Vacante of the Apostolic See and the election of the Roman Pontiff (John Paul II, 22 February 1996), the need arose to adapt the urns to the new norms. It was necessary to add a new urn to the chalice and pyx called for in previous regulations, in order to receive the votes of any cardinals having the right to vote but who were impeded through illness from leaving their room to be present for the voting process in the Sistine Chapel. Rather than creating another urn, three new ones were designed during John Paul II’s pontificate, principally to make them more functional for the intended use, but also to make them uniform.
The function of the urns is described in Chapter V of the Constitution, which also speaks of a plate to be placed on top of the first urn. Every cardinal, in fact, must “place his ballot on the plate, with which he drops it into the receptacle beneath.” The second urn will be used only in the case of the presence in the Conclave of cardinals impeded by illness from leaving their rooms and the third urn will be used to gather the ballots after the scrutiny, before they are burned to produce the traditional smoke announcing to the faithful gathered in St. Peter’s Square either the non-election (black smoke) or the election (white smoke) of the new Pontiff.
The urns are the work of the Italian sculptor Cecco Bonanotte, already known for the new entrance doors of the Vatican Museums that were inaugurated on the occasion of the Jubilee Year 2000. They are made of silver and gilded bronze and their iconography is linked to two fundamental symbols: the first is that of the Good Shepherd and the second of charity. The symbols chosen by the artist for the three urns—a shepherd and his sheep along with more subtle birds, grapes, and ears of grain—are united in a simple and direct way to the meaning that the person of the Pope has in the Church: the shepherd, indeed the Good Shepherd who, in the name of Christ, has the duty of “confirming his brothers” (Luke 22:31) in the faith.
The symbolism of the Good Shepherd, however, also underlines the style of exercising this primacy, which is indissolubly linked to charity. This idea is clearly expressed in the Gospel of John (21:15-25) where “feeding” the flock is joined inseparably to loving care: “Simon of John, do you love me?…” Peter tells him: “Lord, you know everything, you know that I love you: “Feed my lambs.” The relationship of love between Jesus and Peter, and as a consequence between the Pope and the Church, is emphasized in the other symbols used to decorate the urns: the birds, grapes, and the ears of grain. Eucharistic bread and wine, which are Christ, accentuate the idea of charity underlined by the sharing of this very bread and the chalice.
